iPhone 5 camera shutter wont open

OK just bought the 5 a few weeks ago and this is my first apple product. My camera worked just fine for about a day and then the camera shutter locked up and wont open now. It did come back briefly for a few minutes one time and allowed me to take a picture, but now its been locked for weeks and will not let me click anything on the camera screen at all.
Any ideas?

Thanks