These workers, which include me, work by the hour. We make our living by working more hours, not less. If suddenly every hour above 32 became payable as overtime, it would be harder and not easier for us to get by. Let me explain.
Some of us are lucky enough to get by with a ~40hr/wk full-time job. Many, many people for whom their hourly wage is not high enough to meet their financial situation even at 40hr/wk, take on a second, part-time job to take on some extra hours and make some extra money. Scheduling both these jobs simultaneously is already hard as it stands.
If, as Sanders proposes, every hour above 32/wk is counted as overtime, many of our employers would promptly cut down our hours to 32/wk. Thus, we'd have to pick up _at least 8 hours_ a week more at our second job (presuming they were available) just to break even as we used to. While 8 hours may not sound like much, for an already tedious balance between two job schedules, this would, for many, be the straw that broke the camel's back.
This measure would, in short, severely hurt the working class. I have no doubt that the white collar workers pulling in a six-figure salary would welcome the shortened work week, at the expense of the majority in whose name this damaging measure is being proposed.
[0]: https://www.bls.gov/opub/reports/minimum-wage/2021/pdf/home....