How to fix my iPhone 4 lock/power button?

My lock/power button is jammed (I think it's jammed it's not pushing down) and it's getting really annoying to use the assistive touch just to lock my screen. So is there a way to fix it on my own? If not, how much would it cost to get repaired?

Microwave for about 2 min it wil fix the electro digitizer

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