My brother purchased a door alarm sytem to keep our mentally challened father?

from wandering outside.id did not work,he opens the door and trys to get out.the alarm sounds like a loud doorbell.last night it was hell in this apartment ( we live in a ground floor apt of a two family house) my brother lives upstairs in his daughters apt,it was late and thayts when the alarm went off my brother and others were awakened by the alarm,dad opened the door and my brother ran down here to check on things here,he reprimanded my dad not to open the dang door because he woke everyone up.e swore he thought the people from the senior center wre picking him up to go to the center and he was adamant about this as he kept opening the door and waking people up!dad has severe alzhiemers disease and a brain injury.he said he herd someone calling him,he also has hallucinations and hears things.btw he wears a hearing aid and he its out of his ear hes totally stone deaf,how could he hear someone calling him?? he really drove everyone crazy.i think its hopeless we cannt get him out of this programmed habit,do you think tht we will ever kep my dad corraled here? i just want an answer. thanks.