Using Siri to lock phone

Is there any way to have Siri lock my phone so face recognition doesn't work and you need to enter your passcode?

"Hey Siri, lock my phone".

Right now she says she can't comply.

I have my phone set up for the power button to open Apple Pay so the 5 button crush to lock the phone won't work.

It seems to be a simple thing to do just in case someone wanted to snoop in your iPhone by unlocking with your face recognition.

Notice, I'm not asking for Siri to be able to unlock my phone, only lock it so someone would need the passcode.

And yes, I know you can always turn the phone OFF, but I'm looking for something quicker without needing to pick up your phone.

I used to have an Android screen lock widget that would lock out the fingerprint reader and you had to enter a 7 digit number.

Just in case you got stopped by a ***** leo who doesn't understand the law about you not needing to unlock your phone so they can snoop.

Would a shortcut work?