context: sometime ago my parents lost the key and had to broken the lock to get out of home and used the broken lock to lock the door from inside, using only the shackle, then I picked it twice in like seconds, removed the broken shackle and let the broken shackle “locking” the door from inside, now, with no shackle, I cant pick it anymore
also, what is this “button” on the lock? I have 2 other locks from this brand and only this one have it