I work in a factory, and the potential to move up to shift lead is all but given to me by my peers. Ive had several bosses and colleagues (who's opinions and world views align with us) tell me I need to become the lead. The guy I would be inheriting this role from even says I'm the best fit.
However I ain't trying to be some class traitor. I do like the thing we produce, it's been a part of my life for my entire conscious existence. I'm a lucky sucker who followed their passion and while I'm a wage slave, seeing people, even if it is the upper class, deriving happiness from the things I make make me care about the things I produce. I do want to use this position to make the product and the workers lives better. Management already understands I side with labor more often than not.
I am really good at what I do and I have tons of issues believing in myself, but it's hard to ignore the world telling you you got to do this.
A shift lead is barely even middle class, in most of the factories I'm familiar with it is just as proletarian of a job as the regular worker. But even if this isn't the case in your workplace, you should still go for it if it seems like something you would enjoy. Being middle class isn't something that automatically stops you from having radical politics or makes you a class traitor, It just requires a little extra work to stay a leftist in the long term.
Shift lead is barely middle class anymore lol, I'm at $28/hr and with rent and stuff it's basically "buy my co-workers a round every Wednesday" type money. Not "buy a house and a new car" type money.