Phone essentially bricked with locked bootloader

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I have a pixel 3a with a locked bootloader and a very barebones android os on it. It has basically no apps, the only ones shown are clock and settings, the settings app is very stripped down from a regular settings app too. For example, and maybe most importantly, there is no build number so I can't unlock the bootloader. I've tried pressing everything that sounds somewhat related, nothing enabled developer options. The recovery is very barebones as well, it only has reboot or power off options. So this phone is basically bricked.

Is there any hope? Any tools that can force unlock the bootloader? I did find some that claim they can but they seem very sketchy so idk if I want to try those.
Any other solutions are welcome as well of course