How to recover data from a locked android

I have been locked out of my Android phone after updating to Marshmallow. Now, when I enter my pin it doesn't accept it.

1.Here are some details:
2.Its not rooted.
3.It doesn't have a unlocked bootloader.
4. USB debugging is not enabled.
5. No Samsung Account.
6. No Google Account.
7. I have not fotgotten the pin. I Have been using that pin for 8 months.

Help

You must have a Google Account. Android phones are almost useless without one. Same thing with Samsung account if you use any Galaxy app.

Check thread below.

*Forgotten Password Recovery*