Chest Lock is a simple mod that allows you to lock chests easily! Normally in vanilla minecraft you have to use/data merge block [​CORDINATES] {Lock: "KEY NAME"}to lock a chest or other open-able block. Not to mention you have to have an op permission level to use the command. This mod allows you to lock a block with a single command, and a few clicks!

HOW TO LOCK A CHEST OR ANY OTHER OPEN-ABLE BLOCK:

1. Stand on top of the block
   
2. Enter the command "/lock"
3. Select the type of block you are locking
4. Enter the name of the key
5. Click "Lock!"

You can now only open the block by clicking while holding any item named "[​NAME OF YOUR KEY]".

Note: you can skip the first GUI screen by using "/lock chest" or "/lock other", or you can use "/lock [​BLOCK TYPE] [​KEY NAME]" to skip the GUI entirely!