Can I lock my screen with a keyboard shortcut? [duplicate]

Possible Duplicate:
Is there a quick way to lock my Mac?

I'm running OS X 10.7.3

Currently I've found what looks like 2 possible solutions:

1. Hot corner(s) setup in the "Desktop & Screen Savers" preferences
2. Create a service with Automator then map a keyboard shortcut in "Keyboard" preferences

I don't like 1 because it requires the mouse, and 2 seems like a bit of a hack. Is there a built in way to do this? Or should I settle for the workarounds?

Thanks L

Does control+shift+eject ( sleep displays ) solve your problem? (if you set authentication for login)

Or you can use Option+Command+eject Put the computer to sleep.