If he says he doesn't remember his passcode, won't six months in jail pretty much guarantee that he will never remember it? I forget my passwords all the time

If he says he doesn't remember his passcode, won't six months in jail pretty much guarantee that he will never remember it? I forget my passwords all the time if I don't use them frequently. It's like muscle memory, so even after two weeks of vacation I struggle to remember them. Six months of not using it in a high stress environment would definitely cause me to forget it.