I haven’t found a better way than a password protected screensaver to protect my computer from "unauthorized users" when it’s unattended.
The screensaver can be configured to engage automatically after a period of time you select (3 min, 6 min. etc.), filling your screen with selected pictures and images, and disengages when you provide a password. So, when you leave your computer “for a minute” you don’t have to worry about someone using your computer, changing your information, or even seeing your screen. Remember, logout or use a password protected screensaver whenever you leave your computer. Stop. Think. Secure IT!
Resources:
Password Protected Screensaver