For people who want to use multi-factor to unlock their phone, on Android you can set a unlock code for the work profile. So you can have one factor to unlock the main phone, and one factor to unlock the work profile. So any app in the work profile, like signal messenger, would require you to both put your pin in for one factor, your fingerprint in for another factor.

Some ROMs like graphineos allow you to scramble the pin input pattern, which means the grease on the phone doesn’t give too many clues away as to what your pin is. You get used to it after a day or two