function stake(uint256 amount, bool lock_) public whenNotPaused {
    _stakeFor(msg.sender, amount, lock_);
}
function lock(uint256 amount) public whenNotPaused {
}
function stakeFor(address account, uint256 amount, bool lock_) external onlyOperators {
    _stakeFor(account, amount, lock_);
}
- function stakeFor(address account, uint256 amount, bool lock_) external onlyOperators {
+ function stakeFor(address account, uint256 amount, bool lock_) external onlyOperators whenNotPaused  {
    _stakeFor(account, amount, lock_);
}
