Sliding Glass Door Locks can be replaced, heres how

Pet Door Guys In The Glass Pet Door

Sliding Glass Door Handle Set with Lock – Aluminum Handle, Fits 6-5/8 in. Hole Spacing (Black)

Sliding Door Handle, Non-Keyed Sliding Patio Door Handle Set with Mortise Lock, Fits for 3-15/16” Hole Spacing, Non-Handed, Sliding Glass Door Handles Replacement, Black

Sliding Glass Door Handle Set Oak Wood Interior Handle and Exterior Pull White Diecast Finish+Mortise Lock 45° Keyway Fits 3-15/16” Screw Hole Spacing, Non-keyed with Latch Locks(White)