Yeah, it's a pain-in-the-ass to always have to enter a code to open your phone, but I'd rather suffer that than have the cops hold my face in front of the phone to open it up.

You can keep your eyes closed or not look at the phone. I believe iOS needs your attention to allow biometrics. And a few times it fails, it will require the password.

I guess the police would just force your eyes open. They would be allowed to drug you in this situation too.

The police most often use this kind of power in DUI cases where they extract your blood forceably. In the terms and conditions of your driver's licences in the USA most of them say that you agree to allow the police to do this.