Instead of more locks and more keys, just have one lock and more keys.In a house when every one is either working or studying, which makes them to leave at varied timings and also return back at different timings. I have seen that every room has to be securely locked , and then the main door has to be locked and finally the gate has to be locked after every one goes out. Invariably every one should have a bunch of duplicate keys to open the same when they happen to return at different timings. Instead of that, they lock the inside doors and keep the key at a secret place known to the family members and just they have to lock the main door with the door lock and the gate with normal lock and for that one lock is enough but several duplicate keys to be kept safely by members each of them. Then only anyone can go and come at any time to the home.
This is the entry to tow topic Lock and Key.