@800XL I'm afraid, yes. You can try but there is no guarantees that it is possible at all. I have checked it across some forums and looks like it's pretty uncommon situation when Pixels are locked. Anyway, Pixel 3a is pretty cheap today (I've bought one in less than $100 with ideal condition) so if you have the version with encrypted bootloader, you can try to sell your current model and buy a new one without encrypted bootloader (probably it may cost a little more if you search specifically 🤷‍♂️)