In many cities you need to “swipe” to get out, and in most cities in America farecards are used so you would have to discard a farecard since you couldn’t carry it home (presumably you would buy a special farecard for leaving late Friday). You would have an additional problem of electronic devices connected to the exit turnstyle counting who is leaving. Also you would have to be careful to avoid getting caught in a door as that would trigger an electronic device.
I suggest taking the subway home on Friday evening is best left for alternative history novels in which Jews have to be pretending not to be Jews to survive.