code: def EnableJob(self, job_id, token=None):
      
      job_urn = self.CRON_JOBS_PATH.Add(job_id)
      cron_job = aff4.FACTORY.Open(
          job_urn, mode="rw", aff4_type=CronJob, token=token)
      cron_job.Set(cron_job.Schema.DISABLED(0))
      cron_job.Close()
docs: Enable cron job with the given URN.