Four decades ago, analogous jobs (manual labor, no college degree) were in the car industry: at Ford and GM. Those jobs were good middle-class jobs with good salaries. On those jobs, one could raise a family with a 40 hour work week, and do very well working 50-60 hours a week.
Today, the similar jobs are in Amazon warehouses. What is different? A big one is that we have removed worker protections from our economy. By going to an unregulated free market, now Jeff Bezos is a multi-billionaire and his workers are living in near-poverty.