Need replacement storm door lock kit

A handy person from Downingtown PA says:
The locking mechanism will lock when turning the knob and get stuck where it will not unlock again even with a key.
User submitted photos of storm door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
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.
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