My iphone4 power button is stuck. How can I fix it?

I looked online and saw this was a common problem but saw no sure solution. I got the iPhone 4 for my birthday in October so it's only two months old. I was at work yesterday and wanted to lock it before putting it in my pocket. The button didn't work. I lifted the rubber part of my otter box and tried, but the button won't move. I think dirt or something may have gotten in there because as you probably know, these cases trap a lot of dust and dirt. What should I do to fix it? It seems like a simple problem.

Under Settings, there's a feature called Assitive touch, turn it on, and a white circle button should pop up on screen, when you tap it, it allows you to lock your phone and go to the home screen

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