Forgot lock pattern in One plus one phone

My girlfriend set a pattern lock for One plus one phone and she cannot remember the pattern now. I have a very sensitive data and also many valued pics. kindly help me recover the data or remove the lock. Please please please please help me. I am in big trouble without the data. I spoke to One plus customer service rep, they said reset is the only option. But i will loose the data and I can't afford to loose the data.