Patio door lock staying on locked position

A home owner from Fishers IN says:

This handle and lock slides into the lock position and doesn't stick in the unlock position. Looking for a fix or replacement.

My patio door lock handle will not stay in the unlocked position.

Some Measurements:

Interior Handle with lock

3/8" across

6 5/8" tall

Lock/Tongue 1" and attaches to the left side of the patio frame

Door thickness = 1 1/4"  Thank you!

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Bob from SWISCO responded:

This exact handle set is no longer made, but our 82-036. Take a look and see if you think this could work as a replacement. 

A home owner from Fishers IN says:
Thanks, Bob. I think i'd have to make the holes in the sliding door larger for this to work.
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