i'm repeating myself again, but why not.
the locks are a concept, a new way to do things that offers risks as well as benefits. in the old system, you have a 4 digit code. that's a lot of potential combinations, except people are speds and do things like 1212 which is easily remembered and also easily cracked. once you have put in the code, it is impossible to open without the code or destroying it. but it is safe.
personally i would make a similar system for the keys. when you apply a lock, you automatically get a key in your inventory. when the door is closed, it is locked, and can only be opened by someone with the matching key. scrap the lock/unlock functionality entirely, it is always locked and provided you have the key, it will open for your like an unlocked door.
locked doors can have new keys made only when they are open. an open door cannot be closed by someone without the matching key, but since you can make a key from the open door, it's not a problem. now people aren't fiddling with their doors, they work the same as legacy, but with the option to make a key instead of changing the code.
to change locks, apply a new lock to the open door. you get supplied with the new key. the old lock is destroyed in the process, and old keys have no matching lock and become useless.
to change a lock to a currently carried key, use the key on the lock in your inventory before applying it instead(not consumed). now when installed it matches your current key.
now you can open multiple doors with the same key in your inventory, or have a key for each door as you like.
i also think that keys should be marked in some way, even if its just some kind of tooth variance or colour. also probably should be made of metal frags rather than wood.
slightly off topic; i think tier one should be a latch. only usable from the inside, and built into the door as standard. so you can stop people coming in when you are inside, but only from inside.
tier 2 should be key locks.
tier 3 should be combination locks.
It doesnt even need to be that complicated. Thats still a mess for people who have multiple doors.
the locks are a concept, a new way to do things that offers risks as well as benefits. in the old system, you have a 4 digit code. that's a lot of potential combinations, except people are speds and do things like 1212 which is easily remembered and also easily cracked. once you have put in the code, it is impossible to open without the code or destroying it. but it is safe.
dont see anything wrong with this. and i've never heard of anyone guessing someone elses combination.
I just want a solution that means if you get killed as soon as you leave your house then someone isnt just able to take the whole place