Jeldwen Sliding Door (2014) - Exterior Lock Needed

A handy person from Chicago says:
February 17, 2015
Hello,

My mother had this door installed a few months ago and soon realized there is no keyed lock with it. Can you determine what lock assembly is needed from the attached photos? It appears to have a punch-out to install a mortise lock but, without having that tumbler I do not want to attack this thing.

Please let me know what to order.

Thank you in advance.

Best,
Nathan.
User submitted photos of patio door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
February 20, 2015
Hey, Nathan. Looks like you already have a mortise lock installed. The punch out is for the key cylinder, which could be our 82-310. Do its dimensions look about right? If you aren't comfortable knocking or drilling the punch out, you could contact a local locksmith for further assistance.
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