kill the lock

$ killall -s 9 krunner_lock

[ZT][From:] http://www.commandlinefu.com/commands/view/2264/unlock-your-kde4-session-remotely-for-boxes-locked-by-kde-lock-utility

Alternatives

There are 3 alternatives 

qdbus org.kde.screenlocker /MainApplication quit

 

qdbus | grep kscreenlocker_greet | xargs -I {} qdbus {} /MainApplication quit

 

qdbus org.kde.krunner_lock /MainApplication quit; qdbus org.kde.plasma-overlay /MainApplication quit