code: public function dispatchNextJobInChain()
      {
          if (! empty($this->chained)) {
            new PendingDispatch(tap(unserialize(array_shift($this->chained)), function ($next) {
                  $next->chained = $this->chained;
              }));
          }
      }
docs: Dispatch the next job on the chain.
  
  @return void