A wage is debt, so not beneficial in and of itself. It can be beneficial when you call the debt and turn it into something tangible (e.g. food), of course, but that is also of benefit to the business who derives joy in giving you that food. It is not for the benefit of workers. It is for the benefit of everyone.
It wasn't a sudden bout of benevolnce from the FDR administration, or from anyone in the management or government.