Help with lock for sliding glass door

Hey, Krista. Looks like your handle set is in good condition, so you could probably just use our 82-310 key lock and install it in your existing outside handle. Just make sure that the hole in your outside handle is aligned with the inside thumb lever; the tail on the 82-310 key lock and the tail on that thumb lever need to meet in the same spot. If yours doesn't work like that, let me know and we can recommend something else.