@Override
    public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ) {

        ItemStack lockKey = new ItemStack(SecureItMod.lockAndKeyItem ,1);

        if (SecureItMod.instance.isLocked(world, x, y, z)) {
            if (SecureItMod.instance.isKey(world, x, y, z, getKey(stack))) {
                if (player.isSneaking()) {
                    SecureItMod.instance.unlock(world, x, y, z);

                    stack.stackSize--;
                    player.inventory.setInventorySlotContents(player.inventory.currentItem, stack.copy());

                    if (!player.inventory.addItemStackToInventory(lockKey.copy()))
                        player.dropItem(SecureItMod.lockAndKeyItem, 1);

                    MessageUtil.sendMessage(player, "Unlocked chest.");
                    player.inventory.markDirty();
                }
                return false;
            } else {
                MessageUtil.sendMessage(player, "Wrong key...");
            }
        }

        return true;
    }