function increaseLockBalance(address _holder, uint256 _value)

    public

    onlyOwner

    returns (bool)

  {

	require(_holder != address(0));

	require(_value > 0);

	require(balances[_holder] >= _value);

	

	if (userLock[_holder].release_time == 0) {

		userLock[_holder].release_time = block.timestamp + lock_period;

	}

	

	userLock[_holder].locked_balance = (userLock[_holder].locked_balance).add(_value);

	emit Locked(_holder, _value, userLock[_holder].locked_balance, userLock[_holder].release_time);

	return true;

  }