Question: lock is broken on door?
Answer: Weather Stripping as a Cause of Faulty Lock. Weather stripping is one of the most common reasons for a malfunctioning door lock latch or a broken lock. ... 
The Lock is Not Budging. ... 
The Door Lock Latch Doesn't Click Into Proper Alignment. ... 
Door Lock Has Frozen. ... 
The Lock Bolt is Not Operating.