I cannot understand why you would think so, even in a first world nation.
Who would grow your food? Who would make the tools and fertilizer that enable the farmers to grow your food? The robotics and software that enables those tools and fertilizer to be produce? Who would organize, transport, package, preserve and process the produce so that you can access it?
Apply the same questions to healthcare, education, transport, construction, entertainment, etc.
Some jobs are superfluous and arise out of coordination failure, that's true. Lawyers, administrators, salespeople and parts of finance and the government comes to mind. But "most people could stop working" is an unreasonable assertion.