Transparent screensaver (screen lock), could be a xscreensaver program, any?

Web search found https://superuser.com/questions/363347/transparent-screensaver-for-linux , which dated 2011, recommends xlock -mode blank -geometry 1x1, I'm on Linux Mint based system and seems official repos do not have xlock, so I figure maybe it's outdated for modern Linux. What can I use now in place of the above? Or maybe a program for xscreesaverthat just does see-through of the screen. TIA