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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def next_future_job_delta(self) -> Optional[float]: """Give the amount of seconds before the next future job is due."""

        job = self._get_next_future_job()
        if not job:
            return None
        return (job.at - datetime.now(timezone.utc)).total_seconds()