The locking mechanism to a sliding glass door

Thanks for reaching out! Your patio door mortise lock reminds me of the 82-265 Multi-Point Mortise Lock with a faceplate. To confirm that this is the right replacement, you'll need to compare the dimensions for the faceplate to your existing lock. 

This lock features an anti-slam button to prevent the door from being put into the "locked" position when open, extending the hooks.

Alternate image for 82-265