enqueue_at

# File activejob/lib/active_job/queue_adapters/sidekiq_adapter.rb, line 29
      def enqueue_at(job, timestamp) #:nodoc:
        job.provider_job_id = Sidekiq::Client.push            "class"   => JobWrapper,
          "wrapped" => job.class,
          "queue"   => job.queue_name,
          "args"    => [ job.serialize ],
          "at"      => timestamp
      end