public function unlock_key(KeyAutoUnlocker $auto_unlocker)
{
$key = $auto_unlocker->getKey();
if (empty($key)) {
$this->ReportError('Empty key in the AutoUnlocker', __LINE__);
return false;
}
$auto_unlocker->revoke();
return $this->redis->Del($this->lock_key_prefix . $key);
}