Why doesn't my iphone's sleep/wake button not work?

So my iphone's sleep/wake button feels weird.whenever i push it, it feels like i have to push it harder for it to work. Can i fix this by myself or do i have to get it repaired? And if i do have to get it repaired, how much would it be because i don't have warranty on it.

46$ maybe you just must clean.anyway follow this link http://www.ifixit.com/...ton/4332/1

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