Iphone 5s lock button broken?

I've had my iphone 5s for only 2 weeks and the lock button is already very hard to press. I haven't done anything with it si it's very strange. I'm so worried it will stop working after a while (it works, I just have to press a little harder than usual and it doesn't make a clicking sound). Will it completely stop working after a while?

This happened to me. Take to the apple store. They will probably replace(email it too you but you have to send the other one back ) it if you have a plan and stuff
Hope I helped.