When did fast food jobs or coffee shop barista become a career rather than a job pimple face geeks do in highschool?

When I grew up it was always a high school job, or part-time job or second job, when and why did it become a career? And what do people want to get out of that career?

When did fast food jobs or coffee shop barista become a career rather than a job pimple face geeks do in highschool?
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