door lock will not unlock

A home owner from yorba linda ca says:
no name, or numbers on door.

User submitted photos of patio door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
My first thought is that your handle could be worn. See if you can remove the handle and try to work the internal mortise latch using a screw driver or anything else you can get to try and work the latch. Try using a spray lubricant to see if that can loose it up, as well. If that internal mortise latch is broken that could be a problem. I'm afraid at this time we do not have a replacement for this handle set.
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