I beg to differ to those who write that such events are expected, just press a few buttons, disable, or something similar.
Imagine you are not in a a relatively "democratic" nation.
(0) You are asleep. You phone is on the nightstand. At 4:00 in the morning, you wake up with a rifle stuck in your face.
(1) You are walking down the street, middle of the day. Your phone is in you jacket inside pocket. Two burly individuals grab each of your hands, tie them and then toss you into a van that just pulled up.
(2) You are walking around, let wind on your face and feel it in your hair. Your cell phone is in your jilbab or burqa, you changed out of. A rock hits your head and you black out.
(3) you walk into the public WC/bathroom in the bar, but you do not take your phone in with you because it is just ... ick. You come back out and the phone is in the hands of a local law enforcement agent.
Each one of these have happened in real life. There are just a myriad of real scenarios where someone is not in reach of their cell phones.
You have already described prerequisites. It is unwise to use biometrics if you are a person of interest in a "not so democratic country". And to get a riffle to your face they should demolish a door which is commonly steel in a "not so democratic country". This is loud and gives plenty of time.
Nothing happens out of the blue. People don't get searched randomly except some rare places where an iPhone is the source of danger itself being a valuable possession.
If someone feels that such events could happen it is mandatory to do OPSEC. If not, bad for this someone. Anyway, a proper torture will reveal the password in a "not so democratic country". Which also happens in the real life.
On my android phone, if I hold the power button I get the option to "lockdown", which immediately locks the phone and disables biometrics for the next unlock, requiring the PIN/password.
I assume that would work for the situations you have in mind.
The event itself is often expected. Nothing happens out of the blue. The exact time of the event is unknown. So, extra precautions like disabling biometrics before leaving home is a normal risk mitigation practice.
On my android phone, if I hold the power button I get the option to "lockdown", which immediately locks the phone and disables biometrics for the next unlock, requiring the PIN/password.
I assume that would work for the situations you have in mind.
Imagine you are not in a a relatively "democratic" nation.
(0) You are asleep. You phone is on the nightstand. At 4:00 in the morning, you wake up with a rifle stuck in your face.
(1) You are walking down the street, middle of the day. Your phone is in you jacket inside pocket. Two burly individuals grab each of your hands, tie them and then toss you into a van that just pulled up.
(2) You are walking around, let wind on your face and feel it in your hair. Your cell phone is in your jilbab or burqa, you changed out of. A rock hits your head and you black out.
(3) you walk into the public WC/bathroom in the bar, but you do not take your phone in with you because it is just ... ick. You come back out and the phone is in the hands of a local law enforcement agent.
Each one of these have happened in real life. There are just a myriad of real scenarios where someone is not in reach of their cell phones.