How easy is it for a bad guy with a Toyota Wheel Lock key to steal my tires and wheels?

You should have been on Ricky Bobby’s pit crew!

 

Nah, I'm not that good, if I removed em with my teeth then maybe haha

 

I'm paranoid about someone stealing my wheels and tires.
Anytime i park my truck whether it is at home or a place of business or i'm on a vacation somewhere, I remove all 4 tires and lock them inside the truck, 2 in the back seat and 2 in the bed under the cover and i'll put them back on when i leave. It makes running errands a bit lengthy but it sure does give me some peace of mind.

 

Good thing you don't have a F150 or a civic

 

This!
The only person slowed by them is the owner who looses them. As mentioned, a shop will zip em right off,,, and add a healthy adder to your bill too.
No one wants stock wheels, you can't even give the damn things away. I'd be more worried about your catalytic convertors (worth reall$$) or some crack-head drilling your gas tank for a splash of gas.