Deadbolt Stuck in the Locked Position? What to Check

A deadbolt that won’t unlock is usually binding against the strike, not broken. Push or pull the door to take pressure off the bolt and try again. If the key or thumb-turn spins freely, or nothing moves at all, the lock may have an internal problem, and opening it without damage is usually a pro job.

Tap to watch

Do I Really Need a Locksmith? · Bill’s DIY series

“I can do this myself.” Do I really need a locksmith?

Verdict: Pro job

Watch how locksmiths open a locked deadbolt

Get the Lost-a-Key Guide →$4.99 · instant PDF download

Safe checks first

1. Take the pressure off. Push the door firmly toward the frame, then pull it toward you, while turning the key or thumb-turn. A door that has shifted can pin the bolt.
2. Try the other side. If the key won’t turn outside, try the thumb-turn inside (or ask someone inside to try).
3. Try another key. A worn or poorly cut copy may not lift the pins correctly.
4. Check smart lock batteries. If it’s an electronic deadbolt, weak batteries are a common cause. Many have a key override or emergency power contacts. Check your model’s manual.
5. Dry lubricant only. A little graphite or lock-rated dry lubricant in the keyway can help a stiff cylinder.

Turns but won’t unlock

If the key or thumb-turn turns freely but the bolt doesn’t move, the part connecting the cylinder to the bolt (the tailpiece or cam) may be broken or disconnected. That isn’t something lubricant fixes. From the inside, removing the thumb-turn can sometimes show the problem. From the outside, it usually needs a locksmith.

Stuck from the inside

If the thumb-turn won’t move, look at the door edge with the door open (if you can open it). A bolt that drags only when the door is closed points to a line-up problem. See door won’t latch for the marker test. If it’s hard to turn even with the door open, read deadbolt hard to turn.

Why a deadbolt sticks

• Door sag or swelling pushing the bolt against the strike
• Strike hole too shallow so the bolt jams at full throw
• Worn key or cylinder
• Broken tailpiece or cam
• Dead batteries on a smart deadbolt

Learn the parts in how a deadbolt works.

Why opening it is often a pro job

Bill’s video above shows how locksmiths open a locked deadbolt without a key. Drilling, forcing or prying usually damages the door, the frame and the lock. A locksmith has tools to open many locks without damage, and can confirm you’re authorized to enter. Once it’s open, fix the cause so it doesn’t happen again, and consider whether to rekey or replace.