Regarding unlocking my phone without data loss

Hi All
I am using one plus one with cm 13. I forgot the pattern to unlock. Is there any way to unlock the pattern and login to the phone.

I tried to copy the data but I am not able to copy since the screen is locked.

I have tried to lock using Android Device Manager but that is also asking for pattern to enter the password.

Since I have not enabled the developer mode .. I am not able to use adb commands also ...

I am able to use the fastboot mode, but from that mode, I am not getting any option to unlock ..

Can you pls help to unlock the phone or copy the data before doing factory reset..

Thanks

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