As children on farms and ranches, or in the mail rooms of large companies, or as journeymen for physical trades, or a thousand other low level opportunities that no longer exist, require degrees, or that they're now having to compete against aging baby boomers for.
I never worked in food service. I worked in retail (sales and stocking), delivery services, freight (un)load, construction trades and the military. Every one of those still exists, is not going away any time soon and qualifies as entry-level.