Require keyed locks for metal sliding patio door (72x 80 inches.) Manufacturer unknown, photos provided

Have an exterior metal frame patio door with 4 panels 72 x 80 inches and a screen with a pull up latch to secure the door from the interior only. Photos of latch attached. I need to install a keyed system instead of the latch so that entry to the basement can be attained from the external patio. THERE IS A PLASTC STICKER ON THE DOOR WITH THE FOLLOWING INSCRIPTION:"TRUVIEW ALUMINUM PATIO SLIDING DOOR 82GP IN. CMHC ACCEPTANCE NO. 7923.

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Need to purchase a keyed system to replace the latch.