Did you know about this hidden menu on Samsung Galaxy smartphones? You can use it to test different aspects of your phone like if you think your LCD/touchscreen is not working properly, LED indicator, vibration, cameras, etc.
Latch Stopper ... to keep the door quiet for nap times, to keep little ones from getting "stuck" in rooms ... etc., etc., etc. No link to instructions. I am assuming simply sew two pieces of fabric together with a pony tail holder (elastic band) sewn into each end.