Aside from the obvious factory reset (and noting that Findmyphone does not have an unlock feature anymore), does anyone know if it's possible to book an appointment with a Samsung engineer in a physical shop and have them unlock the phone without a data/factory reset?

I have all proof of purchase and ownership but no other methods of unlocking, the pattern decided to stop working just minutes after it was previously successful. I use it dozens of times a day.

I have tried soft-reset, safe mode, nothing makes the pattern work so far.