One click lock out on Windows

My ThinkPad doesn't have a Windows key. It doesn't bother me too much. But I really miss Windows+L to lock out my laptop screen when I have to leave computer for a second. So I made a shortcut to lock my laptop screen.

%windir%\system32\rundll32.exe user32.dll, LockWorkStation

I still have to use mouse but better than going through Start button.