Debian + XFCE xscreensaver alternative screen lock

Step one
sudo apt-get purge xscreensaver xscreensaver-data
Step two
sudo apt-get install light-locker
Step three
# which light-locker-command 
/usr/bin/light-locker-command
Step four
Bind global hotkey (keyboard settings for XFCE case) for command /usr/bin/light-locker-command -l
Based on this solution