Lock won't unlock.

A home owner from Connersville, IN says:
February 1, 2017
Interior Lock Knob will turn but mechanism does not unlock door. Door was installed prior to home ownership so I don't have an exterior key. Cannot enter or exit door due to permanently locked. How do I repair lock mechanism or purchase new parts or the entire unit? Thanks much.
User submitted photos of a door handle set.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
February 7, 2017
I'm afraid this lock set is no longer available. You might want to consider something like our 40-049 lock set. It is a little different than the Pado one you have, but I have used this handle in the past to replace the Pado and it seemed to work well. See what you think.
Complete Mortise Lockset, Brass
Complete Mortise Lockset, Brass
40-049
$72.02
How to install the Swisco 40-049 Mortise lock set.
How to install the Swisco 40-049 Mortise lock set.
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How to flip a storm door mortise latch.
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