Locksmiths are called on to work on all sorts of different doors. Had a job this week where a garage door wouldn't open. The key would turn in the lock but didn't unlock the handle to allow the door to be opened. Part of the mechanism inside the handle had snapped which was why it was not working. After I had fitted a replacement handle I checked the locking mechanise was working with the door open then went to close the door. The door was very tight in the frame which had been putting strain on the lock and handle causing it to break.