First separate two problems: a key that will not rotate, and an unlocked SentrySafe chest whose lid will not release. In Bill’s video, the chest is already unlocked; seal pressure loads the latch, so pulling harder doesn’t help. Gentle downward pressure on the lid unloads it.
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Verdict: MaybeSentry lid stuck? Relieve the seal pressure
Get the Safe Won’t Open Checklist →$4.99 · instant PDF downloadInside: the 60-second sanity check, keypad battery swaps, key and dial tips, Sentry-style safe tips, what not to do, and when to call a pro.
Watch the latch-pressure problem
The video is titled “How to Open a Sentry Safe When the Key Won’t Turn.” At about 0:11, Bill clarifies that this chest is already unlocked. Around 0:18–0:59 he shows the latch and seal: downward pressure lets the latch release instead of fighting the seal.
If the player above does not load, open this Locksmith Blueprint video on YouTube. This fix suits a matching chest or lock box. It is not a universal fix for every SentrySafe key, combination dial or electronic safe.
If your chest is unlocked but the lid will not open
- Confirm the unlocked position in your model’s manual. Inserting the key doesn’t prove the lock is unlocked.
- Stop pulling up on the handle. On the chest shown, upward pull keeps pressure on the latch.
- With the chest stable, press gently down on the lid while you work the normal release. This is the pressure-relief move from the video. Keep fingers clear of the closing edge.
- Stop if the release still won’t move. Forcing the handle, prying the lid or levering the key can turn a simple problem into broken hardware.
Once it opens, check for an item caught at the lid or latch and watch it work normally before locking it again. Don’t remove or cut the seal to make the lid easier to open. Front-opening doors and other latches need their own manual.
If the key itself really will not turn
A key that can’t rotate hasn’t reached the “already unlocked” condition above, so treat it as a different problem.
- Confirm the key belongs to this unit. Similar-looking keys aren’t proof of a match. Use your manufacturer records instead of forcing an assortment of keys.
- Check that it seats normally. Look for a bent key, damage or an obstruction. Try an undamaged matching spare; don’t push a half-inserted key harder.
- Know what the key is for. It may run a chest lock, an override on some models, or an extra lock alongside a combination.
- Use your model’s direction and sequence. SentrySafe models don’t share one universal key-turn direction.
If the correct, undamaged key still won’t work, contact SentrySafe or a locksmith who services safes. Say whether the key won’t insert, won’t rotate, rotates without releasing, or works but the lid sticks. That helps more than “the safe is broken.” Similar key-and-lock wear is covered in why keys stop working and why keys wear out.
A dual key is not necessarily an override key
On the SentrySafe SFW123DSB combination-and-dual-key model, the manufacturer describes the key as an extra control that can block access even when someone knows the combination. Don’t assume the key replaces the combination just because both are on the front. Check your manual before deciding a working key has failed.
When batteries matter—and when they don’t
A purely mechanical keyed chest has no battery problem. On an electronic safe, weak batteries can affect the digital lock, but battery type and access vary by model. SentrySafe’s battery guide specifies alkaline batteries for many models and CR123 lithium batteries for FP/FPW models.
Note what the keypad does (no response, a warning, or an accepted code that doesn’t open) and check the matching manual. New batteries don’t prove the mechanical key or latch is working.
Batteries for matching electronic SentrySafe models
Electronic battery faults only. These batteries do not fix a mechanical key that will not turn, a purely keyed chest, or an already-unlocked lid held by seal pressure. Identify your model and follow its battery instructions before buying.
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Duracell Coppertop AA Batteries, 16 Count
Compatibility: Only for electronic models whose manual specifies AA alkaline cells; replace the complete set with fresh matched cells. Not for a purely keyed chest, stuck mechanical key or seal-loaded lid.
Fresh alkaline cells address a documented low-power electronic-lock symptom before the owner assumes the lock has failed.
View Duracell Coppertop AA Batteries, 16 Count on Amazon (paid link) →Energizer 123 Lithium Batteries (2 Pack), 3V Photo Batteries
Compatibility: SentrySafe FP/FPW models requiring two nonrechargeable CR123 lithium cells per manufacturer instructions; not AA models, rechargeable 16340 cells or mechanical keyed chests.
These nonrechargeable 3V CR123 batteries match the battery type specified for SentrySafe FP/FPW models.
View Energizer 123 Lithium Batteries (2 Pack), 3V Photo Batteries on Amazon (paid link) →Find the right instructions or replacement key
Use SentrySafe’s model and serial-number locator, then its product-manual lookup. Label locations vary; don’t tip a heavy safe just to read a label.
Missing the key or combination? Start with the manufacturer’s lost-key and combination support and keep your ownership records ready. Never post your combination or private documents in public video comments.
Learn to tell the lock from the load on it
A lock can be unlocked while pressure still keeps its latch from moving. For door hardware, the same idea shows up in common lock problems, why your deadbolt is hard to turn and why keys stop working. Door locks and safe locks are different mechanisms, so use each guide for its own hardware.
New to locksmithing? The free Beginner Locksmith Path connects these observations to the fundamentals, with optional structured training after the lessons.
Before you buy parts or book a locksmith
Use the free lock-check checklist to record your symptom, hardware and measurements. Keep it beside the matching repair guide so you buy for the problem you actually have.
Printable guides from Bill
Before you buy parts
Bill’s free checklist helps you name the problem and identify the hardware before you buy parts or book a visit.
Printable PDFs from Kwikpick Lock and Safe. Instant download, checkout by Gumroad. More for new homeowners on our new homeowner page.
Locksmith BlueprintLocks Made Simple
Real locksmith know-how from Bill, a working locksmith in Arizona: short videos, plain-English guides and printable checklists.