Iron Chests shouldn't need to be locked. Maybe you want to take advantage of their benefits over a wooden chest (opening even inside walls, taking up less space, creeper-proof). Maybe you want to deposit things in to them, or maybe you just want to share with everyone on the server from a receptacle that can only be removed by you or an operator.
Please add an 'Unlock' / 'Lock' button to the Iron Chests so this can be an option.