Comment on Intic Lock

This function is already in OS X.

In Applications folder, open Utilities folder. Open Keychain Access app.

In Keychain Access menu, select Preferences. In General tab, click "Show keychain status in menu bar". Padlock icon appears in menu bar, shows whether login keychain is locked. (You can quit Keychain Access now.)

Click padlock icon, drop down menu appears. Click "Lock Screen". Screensaver appears.

Touch any key, login box appears. Enter login password to unlock screen.