Kicksecure no screen lock installed

Morphed Debian into Kicksecure xfce. All went good, but no screen lock available, only Log out. xflock4 does nothing, “xfce4-screensaver-command --lock” - command not found.
What should I install to fix it?

Screen lock is only present when user is logged out, but it expected to be available when try to lock screen too.