How can I lock the screen on RMBP allowing applications to work.

I'm using my RMBP at work, when I go off to get lunch or any other time I'm out of my office for several minutes I want to be able to lock my screen.  I want downloads in the background, or renderings to keep working while it's locked, but the only thing I've been able to find is to shut the lid, which puts it to sleep...
Control, Shift, Power turns the screen off, but any press of a key wakes it back up.  I'm assuming I'd have to pass code lock the computer (I don't want to have to key in the pass code every time I open the lid, but I understand if I did)... how can I make it go to a password protected lock screen with out going to sleep.
In windows its very easy, window key + L, lock screen.  Can I duplicate this functionality on a Mac?

Open system preferences and go to "Desktop & Screen Saver"
Select the "Screen Saver" tab, select a screen saver and then select the "Hot Corners..." button.  You will be able to set hot corners that will start the saver when you move the mouse cursor to that location.
After you have setup the screen saver, got back to the system preferences top menu and select "Security & Privacy".  You can change the setting to require your password to unlock the screen after the screen saver starts.

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