enqueue_at

# File activejob/lib/active_job/queue_adapters/sidekiq_adapter.rb, line 27
      def enqueue_at(job, timestamp) #:nodoc:
        job.provider_job_id = Sidekiq::Client.push            'class'   => JobWrapper,
          'wrapped' => job.class.to_s,
          'queue'   => job.queue_name,
          'args'    => [ job.serialize ],
          'at'      => timestamp
      end