IF I remember correctly, In n Out actually sends their prospective employees to “Hamburger school”. They weed out the incompetent ones before you & see them in their facilities.
Also- I have been eating their food since the 60’s. I have NEVER seen one of their employees with tattoos—metal garnishment on their skin—or not properly groomed.
In other words-—they don’t hire the unemployable dregs.
The lowest hourly wage listed on a wage site for In n Out is $10.88.
FWIW, I used to be in a line of work where we frequently had to hire temps from the services. We always arranged with the agencies to send us their better workers for an extra couple dollars an hour.
At least for what we were doing, the reduced labor cost for their dregs was much more than offset by increased supervisor and management cost, lower productivity, more mistakes that needed to be fixed, etc.
The lowest hourly rate for labor seldom, in my experience, correlates with the lowest total cost for getting a job done.
YMMV