Sorry, Bernie's full of crap. He's deliberately twisting facts to misinform. He's using today's highest minimum wage to calculate paying tuition at levels of 50 years ago, and trying to imply that people only needed to work 306 hours THEN to pay for college tuition THEN. That's just not true.
When I was working during high school / college, minimum wage was $1.50 / hr. That works out to $459 for 4 years of college education. Tuition at public institutions in the mid '70's was $1210 / year nces.ed.gov That's $4840 for 4 years at a time when my comfortably middle-class father was earning ~ $25 K / year. It was cheaper, but not by as much as Bernie claims.
Also, public colleges have always been subsidized by the state. You'd also need to look at the level of subsidy between then and now and whether we're choosing to subsidize less.