docs: def lock(self):
          """
          Lock the config database.
  
          Use if Locking/Unlocking is not performaed automatically by lock=False
          """
          if not self.locked:
              rpc_command = '<Lock/>'
              try:
                  self._execute_rpc(rpc_command)
              except XMLCLIError:
                  raise LockError('Unable to enter in configure exclusive mode!', self)
              self.locked = True