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To unlock screen you need to type in your pass. At home your pass is widely known. Yeah, they can use another user accounts, but you know...

Idea: Allow to set a temporary, one time password when locking screen. An optional message to be shown when trying to unlock would also be great

Why? Sometimes I leave my pc doing something important, that should be interrupted. Since everyone at home knows password, they easily unlock screen an start using PC as usually and by so sometimes terminates the task Some extra password could do the job

You can trick PAM to login with any password. You tell everyone at home a 'password' (any text). But kscreenlocker does not unlock without the real password for me. Maybe it will work for you too.