Door latches catching in locked position

A home owner from Redding, CA says:

Hi, I've been having some issues with my sliding door lock. The top and bottom latches both get stuck in the locked position.  Once I am able to pop the latches open by wiggling the thumb key they operate smoothly. The latches also seem easier to open when I apply pressure above and below the latches when the door is open. 

Is there some adjustment I can make so it is easier to unlock the door or did the previous owner install the wrong keeper? I have already had to replace one thumb key when the spindle snapped from being over torqued.

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Emily from SWISCO responded:

Hello!

It's more likely that some mechanism in the mortise is failing. I'm afraid no adjustments can be made, unfortunately, so you'll need a new lock. See our 82-265 and compare our dimensions with yours to confirm this matches up. 

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