It does work, but you have to select a keyboard combo that isn't already in use. For example, I used Control-Option-Shift-9 and it worked fine. Also, be aware that the Menu Title: must be exact. If you use
Force Quit it won't work. You must use
Force Quit... exactly as shown in the screenshot I posted. To find the proper Menu Title for any keyboard command, look at the menu item on whatever toolbar you're using.