LWC -
http://dev.bukkit.org/server-mods/lwc/This is a lightweight chest protection plugin with a few more features
For a full list of commands type
/lwc
Automatically it will lock:
chests
furnaces
dispensers
You can also lock manually:
wooden doors
iron doors
trapdoors
signs
The main commands are:
To lock an item
/cprivate
To unlock
/cremove
To add a user to your allow list
/cmodify playername
To make public (will be open to everyone but only you can destroy it)
/cpublic