async def touch(self, task_id, increment):
        """
            Update task ttl and/or ttr by increment value

            :param task_id: Task id
            :param increment: Seconds to add to ttr
            :return: Task instance
        """
        args = (task_id, increment)
        res = await self.conn.call(self.__funcs['touch'], args)
        return self._create_task(res.body)