I have seen many individuals work full time and attend college. Some worked two jobs to afford private school tuition, others went to community college. The lucky ones were reimbursed by their employers.
Now whether going back to school is worth it in terms of dollars or job security, that's another question. They might have been better off financially becoming an electrician apprentice, a tree trimmer, or running for office.
My wife and I took turns going to night school (while the other stayed home with the kids in the evenings) for five years. We both changed jobs multiple times. We don't have employer pensions but do have 401ks. My point is anyone can make it if they're willing to work hard.