The keys are kinda metaphorical as like… theres always new opportunities put there (doors to open), and also parts of your past you can leave behind (doors to close). Ogforog has a specific key for everyone, and he knows them all like the back of his hand. Sometimes he even hands out keys to animals or skeletons <3 Everyone deserves a key <3

Also yes Og has all kinds of keys. Old rusty ones and also slightly less rusty modern ones. He might have that key you lost all those years ago and forgot about.