Deadbolt won't open with Key
I had a new door installed with deadbolt lockset....about 5 months ago....it all worked fine until yesterday morning when I went to leave for work. The key would not operate the lock. Tried another key, same thing, no movement at all. With the door open the lock knob opens and closed the lock just fine but even with the door open the KEY will not operate the lock. What could have happened all of a sudden to cause this on a new lock? Guess I need to call a locksmith or should I try to deal with the warrantee on the lockset? Just so irritating....the only thing I can say that has been going on is temps near 100 degrees but have not read anything about heat affecting a lock, just cold. Any thoughts on how to fix myself?