Acess control is not equal to encryption. Sure you can prohibit people from using your things, but that is too superficial.
It's just easier to just use actual secret phrases to access things. Passwords are good. But if you want to make it more convenient then use an access card:
Of course the card can be stolen, but that is another issue. I'd just use memorizable mnemonics instead. Thats the more secure and most convenient way.