Need replacement storm door lock kit
A handy person from Downingtown PA says:
October 26, 2014
The locking mechanism will lock when turning the knob and get stuck where it will not unlock again even with a key.
Dave from SWISCO responded:
October 29, 2014
It could just be that the die cast metal parts in your lock have worn out. Take a look at our 40-049 lock set. It's not an exact match, but check the measurements and compare them to yours. I think it's worth considering, at least.