Anyone know how to lock the screen from the command line in KDE? I can't find any information online that isn't out of date.

At here the:

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qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock

seems to work.

At here:
Desktop: KDE Plasma 5.4.1
Distro: Arch Linux

You might want to use a more generic solution by simply asking logind to lock a session.

Either via `loginctl` or through D-Bus on `org.freedesktop.login1`.

That works great thanks for the responses!

Extension if you want to lock the screen and sleep the computer programmatically or from a shortcut:

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qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock && echo -n mem | sudo tee /sys/power/state

just do loginctl suspend - that will suspend the system and automatically lock the screen.

loginctl lock-session ( there is no loginctl suspend)
to suspend:
systemctl suspend.

sorry, of course systemctl suspend. And yes that locks automatically (I implemented it, because suspend through GUI was broken for me