BlockLocker is a plugin that allows you to lock your chest from other players and share them with your friends
For containers (chests, furnaces, dispensers, etc.) it's easy: just place a sign against the block. BlockLocker will automatically add [Private] to the first line and your name to the second.
You can also place a sign while sneaking, this allows you to add some text to the third and fourth lines. You then need to write[Private] yourself on the first line. You can leave the second line empty, your name will automatically be placed here.
One sign will lock any lockable blocks that are placed right next to each other, meaning you can make a whole wall of chests, lock on chest, and the rest will also be locked, this will help clean up your chest rooms a little more.
For doors, place a sign with [Private] on the first line against the block above the door. Placing a sign on the block below the door or even on the door itself works too, but looks less nice.
Trapdoors can be protected by placing a sign with [Private] on the first line against the block the trapdoor is attached to.
Right-click the sign and type /blocklocker <line number> <text> to replace the text on the given line. You can shorten this to /bl <line number> <text>.
On the third and fourth row of the sign with [Private] you can add the names of up to two friends who may also access the chest. Want to add more people? Place a second sign against the chest. BlockLocker will add [More Users] to the first line and [Everyone] to the second line. If you want to change this, right-click the sign to edit it.
If the name of the person you're adding doesn't fit on the sign, just type as many characters as possible. If the person you're adding is currently online, BlockLocker will be able to complete the name.
If no Minecraft account exists with the name, a ~ is added before the name. However, the ~ is not added for things that don't look like an username, so '–text–' won't be changed to '~–text–'. This should still give you plenty of options to decorate the sign, while it will still be obvious when name is not a valid Minecraft name.
The tag [Everyone] grants everyone access to the protection. The tag [Redstone] grants hoppers access to the container, and allows redstone signal to open doors.
There's also a [Timer:X] tag, where X is a number from 0 to 9. Doors (trapdoors too) will close automatically after the specified amount of seconds. Use 0 to never close the door automatically. The timer tag overrides the default close timer setting the config.yml.