That’s still putting your phone in “plain sight”. They can say they saw an alert or anything they want to legally obtain that phone.

And remember it’s pretty grey if you can refuse your face to unlock a phone. Courts seem to think it’s ok for the most part to be required to.

You need to be really trusting of that officer.

There’s a reason so many security conscious people lock down their phones at TSA checkpoints disabling Face ID etc.

Until they prohibit physical cards, that’s all I’d give them.