Sliding patio door locks are very rarely super secure in and of themselves, and like the fellow before noted, they only accept the lock they were designed for (mostly, anyway, afaik). What you want to do is reinforce along the track behind the sliding door as it's locked. Some folks just use a wooden dowel at the bottom. My shop also sells a product called a Charley Bar that is mounted on the middle of the frame behind the sliding door. It pivots up into the side track while the door is open or in use and back down into a catch mounted on the rear side of the sliding door when it's closed. Like so.