I find the “Sleep” button dangerous (what if someone put the system to sleep while there is something running), but turning off the screen(s) instead would be useful.
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Press the ESC key.
Press the ESC key.
Only toggles a password prompt for me.
What plasma version / Graphics Platform are you on?
The ESC key works here perfectly on Plasma 6 Wayland, even with my “Turn off screen: Never” on AC power management setting, all Monitors are turning off.
On Plasma 5 X11 I had some sort of “xset dpms off and then lock” hotkey (not useable from the lockscreen itself, though), but could even be that ESC would have worked and I was just unaware of it back then, don’t know.
Or, if you are on the current Plasma 6
Does your Monitor turn off, after 20 Seconds of lockscreen, if you set it to?
I already have this… I even have a notification script that turns off the display(s) on lockup (because IIRC in my current Plasma version the power management only turns off the main display).
But if anyone/anything moves the mouse or touches the keyboard, I have to login again to turn off the displays. My current workaround is a command in KDEconnect so I can do it from my phone but I would like anyone to be able to turn off the screen (and nothing more).
Looks like in /usr/share/plasma/shells/org.kde.plasma.desktop/contents/lockscreen/LockScreenUi.qml is the Keys.onEscapePressed event handled.
At least on my Plasma 6.
Maybe that can be modified to run your script instead. Or even a additional button added in that QML.
But I looked at that language only very shallow and my last tinkering with was years ago. Unfortunately can’t probably help you any further with that.
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Still on Plasma 5 on my Kubuntu 22.04, and no such file, but /usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/lockscreen/LockScreenUi.qml looks like a good replacement. Now off to learn QML 
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