code: def list_queues(backend='sqlite'):
      '''
      Return a list of Salt Queues on the backend
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-run queue.list_queues
          salt-run queue.list_queues backend=sqlite
      '''
      queue_funcs = salt.loader.queues(__opts__)
      cmd = '{0}.list_queues'.format(backend)
      if cmd not in queue_funcs:
          raise SaltInvocationError('Function "{0}" is not available'.format(cmd))
      ret = queue_funcs[cmd]()
      return ref list_queues(backend='sqlite'):
      '''
      Return a list of Salt Queues on the backend
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-run queue.list_queues
          salt-run queue.list_queues backend=sqlite
      '''
      queue_funcs = salt.loader.queues(__opts__)
      cmd = '{0}.list_queues'.format(backend)
      if cmd not in queue_funcs:
          raise SaltInvocationError('Function "{0}" is not available'.format(cmd))
      ret = queue_funcs[cmd]()
      return ret
docs: Return a list of Salt Queues on the backend
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-run queue.list_queues
          salt-run queue.list_queues backend=sqlite