It’s quite simple, right now businesses are structured in a totalitarian manner, socialism seeks to overthrow that totalitarian regime within your workplace, there’s a number of ways to do this, nobody is suggesting the janitor should decide how a surgeon does his job, we just want to eliminate the useless position of CEO, and replace it with democratic systems managed by the people who work the jobs.
An easy to understand version of this would be if every company was transformed into a worker co-op, but that of course is only one of many models for socialism.
It is important to note that the government is not the worker, and therefore government control over the means of production DOES NOT COUNT.