Forgot PIN code for MacBook marked as lost

I lost my MacBook so I decided to mark it as lost in the Find My app using my iPhone. Luckily, I found my device. Unfortunately, I can’t remember the PIN code I created that locked my Mac while it was lost. I can’t unlock or access my Mac computer at all. There isn’t a “Forgot PIN Code” prompt so I’m stuck & would really like to be able to use my laptop again so if anyone can help me out it would be greatly appreciated!

[Re-Titled by Moderator]