Such a worry for you. Don’t feel bad about taking him the beer, I have had to watch my Son on one occasion when he had relapsed drink in front of me again, and I hated it and it made me feel ill, but at that time, and when they are in that frame of mind, there is not a lot you can do about it.
Can you get a spare key or do you know where he keeps it?
Always here to chat, sending you big hugs.
Dx