On Windows you can mash Windows-L and it will lock your screen. Or Ctrl-alt-del, enter. (God it pains me to watch people hit Ctrl-Alt-Del and then MOUSE to "Lock Screen"... GRR!!)
My solution in OSX has always been to set my bottom left corner of my screen to "activate screen saver". Then I could just move my mouse to that corner, and viola, locked screen.
But @englishlfc was looking to the same thing with the keyboard, and there are a ton of ways of doing it in Applescript, but it's even easier with Automator.
So, go open Automator, and select new "Workflow".
You'll get a blank screen that looks like this:
Select "Utilities on the left, and then find "Start Screen Saver" in the next column:
Drag "Start Screen Saver" over to the right:
That's it. Save it as an "Application" in Documents or Applications.
Then go to System Preferences and set up a Keyboard Shortcut to activate that App:
I did it a bit differently. I used Alfred's new "Global Keyboard Shortcut" functionality to activate the app.
Maybe this'll help someone.
Want to know how to do this in Applescript?
Please leave comments below.