code: def queues(self):
          
          if self._queues is None:
              self._queues = QueueList(self._version, account_sid=self._solution['sid'], )
          return self._queues
docs: Access the queues
  
          :returns: twilio.rest.api.v2010.account.queue.QueueList
          :rtype: twilio.rest.api.v2010.account.queue.QueueList