I worked my way through college as an auto mechanic. It's the shittiest job on earth. Is there a shortage of auto mechanics? Yes. And there's a reason for that. It's back breaking work, almost always without heat or air conditioning. You bleed on the job every single day. I had to buy thousands of dollars of tools. Long term techs end up with six figures worth of tools, all paid for themselves.
But the worst part is the pay. Flat Rate. There's a book that says how long a specific repair should take, and you get paid that. If it says 3 hours, and a rusted bolt breaks off and you spend an extra 2 hours extracting it, you don't get paid for that. If it's a slow day and there isn't work to do, you don't get paid for that. If a customer doesn't pay their bill, you don't get paid for that either.
The only way to make money as an auto mechanic is to rip people off. Cut corners. Recommend unnecessary service and then don't actually do it. If you feel like you get ripped off at the repair shop - it's Flat Rate. No honest mechanic can make a living.
There's no freaking way a "service advisor" makes $120k. That's the guy at the counter you talk to when you walk in, and they're the dumbest people in the whole shop.