docs: def pop(self, timeout=0):
          """
          Pop a request
          timeout not support in this queue class
          """
          # use atomic range/remove using multi/exec
          pipe = self.server.pipeline()
          pipe.multi()
          pipe.zrange(self.key, 0, 0).zremrangebyrank(self.key, 0, 0)
          results, count = pipe.execute()
          if results:
              return self._decode_request(results[0])