If the lens won’t rotate far enough to come off, the most likely issue is the lens-release/latch mechanism in the camera mount. Since the lens and camera still function, forcing it is not a good idea—you could damage the mount, latch, or lens contacts.

If the camera is still under warranty, the safest recommendation is to send it to Nikon/service support rather than trying to fix it yourself. A repair like this may require opening the camera body to access the release mechanism from behind, and DIY work could void the warranty.

So: don’t force the lens, and if warranty is active, use authorized service.