Lock button on my iPhone is stiff?

I don't know why, but all of a sudden then lock button on my iPhone has become really stiff. It's only about 6months old, so I don't know why this has happened? Anybody know how I can fix it?

The same thing randomly happened to mine and i just took it into the genius bar and they got me a new one.mine was like a year old too so you especially should have no problem.

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