What should I do to solve this?

I've bought an iPhone 5 from USA on 9th Jan. And it's lock button is working partially, means I've to press it hardly then only it works, what should I do?

You will need to find out if its the button thats not functioning properly first then you can purchase spares and replace it yourself if you have the ability.
Alternately you could take it to a phone repair shop.

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