That isn't true. In 2017, 80.4 million Americans were paid hourly, and out of those only 1.8 million made minimum wage or below. (https://www.bls.gov/opub/reports/minimum-wage/2017/home.htm#)

More generally, I'd encourage you to question the mental model that made this sound like a potentially true claim in the first case. An economy where most people are paid minimum wage would be incredibly different than the one we actually have.