How to know or database record was deleted

I'm starting some php workers at the same time and each of them takes a job to do. These jobs are written in database table and when worker takes one - it deletes the record. My code:

$job = Job::first();
if (!empty($job) and $job->delete()==true) {
// so something
}

But the problem is that still some workers take the same $job to perform at the same time! How this can happen?

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