It’ll be interesting to see if it applies to facial recognition. In iOS, at least, you need to look at the phone to unlock it. That’s an intentional action. If you look to the side or close your eyes, it won’t work.
So if you’re conscious, you can’t easily be forced to unlock the phone with your face and eyes if you’re able to resist. But if you’re unconscious, then maybe they could use your face (assuming your eyes aren’t rolled back into your head because the cops gave you brain damage.)