How to execute a job immediately using Laravel Queue

I have a sign up form which send an email notification to the use email and I used Laravel Queue for all my background process.

e.g. Mail::queue(...)

My question is, say I have a 20 queued jobs in my table. And I always want to prioritize all email invitation first, I don't want it to wait. Is this possible? I still want to use the queue principle though.

via Chebli Mohamed