Keys is an LWC type plugin which automatically protects your chests when you place them down for extra protection in the event you have not chosen a town yet.
Towns are the primary form of protection and can protect far more than just chests. We highly recommend you join a town. Simply ask in chat and you're sure to find someone willing to take you in! To read more about towns, type /info town in game.
You can allow other players to access your chests by using the command: /keys add <playerName>
You can remove a players access to your chest with /keys remove <playerName>
To fully remove protection on your chest you can type: /keys unlock and/or /keys unlock
Fully removing protection from your chest will allow anyone to access it. However, if the chest is in a town, then only players in your town will be able to access your chest you've unlocked.