Both of the janitors in my high school (small town) were two of the most prominent businessmen in town. One was worth half a million from an HVAC business, the other had owned three stores, a bar and a bowling alley before retiring to the janitorial position.
The speech at our graduation was given by our janitor!
After grad school, my wife took a short-term minimum wage job in a thrift store. One of her coworkers, who had been there for years, was an older lady from India who (along with her husband) owned several houses and factories, after a life of thrift and savings and careful investment.
She sorted thrift store donations because she liked it.
The speech at our graduation was given by our janitor!