Laravel 队列是异步的还是同步的？例如，如果我添加 2 个作业，它将如何执行？
1）同步：
job #1 started
job #1 finished
job #2 started
job #2 finished
2）或异步：
job #1 started
job # 2 started
job #1 finished
job #2 finished
如果它同步，我怎样才能使它异步（如 2）