Retrieve the next item in the queue.

        Returns deserialized value, or None if there were no entries
        in the Queue.

def next(self):
        """ Retrieve the next item in the queue.

        Returns deserialized value, or None if there were no entries
        in the Queue.
        """
        if self.blocking >= 0:
            # returns queue name and item, we just need item
            res = self.redis.blpop([self.name], timeout=self.blocking)
            if res:
                res = res[1]
        else:
            res = self.redis.lpop(self.name)
        value = self.deserialize(res)
        logger.debug('Popped from "%s": %s', self.name, repr(value))
        return value