HTC Incredible :: Screen Dimming And Phone Locking

I recently made the switch from a BlackBerry Curve to the HTC Incredible. One of the "features" of my Curve that I'm having trouble duplicating on the Incredible is this: I was able to set a timeout to lock the phone and a separate timeout to blacken the screen. That is, if the screen went black after 30 seconds of inactivity, the screen wouldn't necessarily lock until 30 minutes of inactivity. I have increased the screen timeout on my Incredible, but the screen doesn't dim at all. I tried installing the No Lock application, but now I can't find a way to manually lock the phone if necessary.