code: func (l *lockServer) ForceUnlock(args *dsync.LockArgs, reply *bool) error {
  	l.mutex.Lock()
  	defer l.mutex.Unlock()
  	if len(args.UID) != 0 {
  		return fmt.Errorf("ForceUnlock called with non-empty UID: %s", args.UID)
  	}
  	if _, ok := l.lockMap[args.Resource]; ok { // Only clear lock when set
  		delete(l.lockMap, args.Resource) // Remove the lock (irrespective of write or read lock)
  	}
  	*reply = true
  	return nil
  }
docs: // ForceUnlock - rpc handler for force unlock operation.