Removing a broken key stuck in a lock - GIF

Removing a broken key stuck in a lock.

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Previously:

Ancient Egyptian lock mechanism - GIF
Concealed door lock - GIF
Dinner fork door lock - GIF
Unlocking locks with a lockpick gun - GIF
Unusual locks and latches compilation - GIF

Do keys just break off when the lock isn't stuck? I don't recall ever having a key break off in a lock.

The broken key is often a key that was bent and then straightened...