Laravel通知电子邮件门面排队多个用户

这是我的代码,致力于向多个用户发送通知电子邮件

$users = User::whereIn('id', $userIds)->get();
\Notification::send($users, new DealPublished($deal));

它有效,但如果我想延迟它那样

$users = User::whereIn('id', $userIds)->get();

$when = Carbon::now()->addSecond();

\Notification::send($users, new DealPublished($deal))->when($when);

错误是

FatalThrowableError in DealController.php line 226:
Call to a member function when() on null

如何使用队列和通知外观向多个用户发送通知电子邮件？

感谢帮助

试试这样:

\Notification::send($users, (new DealPublished($deal))->delay($when));