How to unlock screen with Bluetooth keyboard

I can wake up the screen of my Android device by hitting almost any key on my bluetooth keyboard. But all I see are my notifications, I can’t actually unlock the screen. How do I get the thing to come up that lets me enter the numbers of my PIN to unlock my screen? Is there a setting somewhere that I a missing that would allow me to just start typing my PIN instead of ignoring what I type?

I’m running stock Android 8.1 on a Google phone.