Can you remove rusted nut with pliers?

if i were putting penetrating oil on it would it easily come out with some pliers?

i tried to change my o2 sensor and i didn't know it would be stuck on so good and it didn't cross my mind since i mean im learning and first time of course doing this. ended up stripping the damn nut idk if the o2 socket will even lock on anymore. planning to get some penetrating oil tomorrow.

kind of want to remove this sensor badly to check if my issue will get fixed. i mean my only other option would be an extractor nut and just chop off the top part and yank it off.

sucks too because i got the first one out easily but the 2nd one on the down stream bank 2 it's stuck on real good. that is sadly the one i need to replace to fix the issue or see if it will fix it.