[gentoo-user] Unlocking Plasma desktop in Gentoo without systemd

[Mick]

I started a plasma session and after some period of input inactivity I noticed 
the screen blanked out.  Later on I moved the mouse and to my surprise I 
obtained this message:
*********************
"The screen locker is broken and unlocking is not possible anymore.
In order to unlock switch to a virtual terminal (e.g. Ctrl+Alt+F2),
log in and execute the command:

loginctl unlock-sessions

Afterwards switch back to the running session (Ctrl+Alt+F7)."
*********************

Given this is a non-systemd Gentoo installation and I intend to keep it this 
way as long as reasonably practicable, what should I instruct the user to do 
to recover their current plasma session?

If this is a default Gentoo installation with openrc, why does a default 
plasma desktop screenlocker comes up with this nonsense?

-- 
Regards,
Mick