The 1938 minimum wage law only applied to "employees engaged in interstate commerce or in the production of goods for interstate commerce," but in amendments in 1961 and 1966, the federal minimum wage was extended (with slightly different rates) to employees in large retail and service enterprises, local transportation and construction, state and local government employees, as well as other smaller expansions; a grandfather clause in 1990 drew most employees into the purview of federal minimum wage policy, which now set the wage at $3.80.[35]
There is no delegated power given the federal to set a minimum wage law that would be applicable anywhere within the jurisdiction of a State. The 10th Amendment therefore forbids them.
Nor is there a power to regulate things which merely affect commerce between the States but are not in fact actually commerce between the States.
Moreover the commerce clause, what was actually agreed to when the Constitution was ratified, was only about using federal power to prevent the States from using their authority to interfere with interstate commerce. It had nothing to do with what private persons did on their own when choosing to engage in commerce.
The 1930s was the decade the Constitution was kicked to the curb by a lawless Court. Progressives, lovers of Arbitrary government, have only built on that.