Phone asking for a code all of the sudden

Hi there!

On my phone, i dont use a passcode. But yesterday night, all of the sudden i see a message saying “user data is locked, please enter a PIN to unlock”. How do i still get access to my phone now? ive tried everything but nothing is working. And my phone is still locked,

any tips out there on what to do next?

how can i restore my data now, is there a way?