To that point, I always keep my shop door locked. My neighbor used to think it funny to slide in unnoticed and “surprise” me. Yes, he is a moron. More stories about him later.
If your table saw blade is parallel with your miter slot then your fence is easy to keep parallel with your blade. I have a 1947 Unisaw and the miter slot is 3/4”. Since I used the miter slot to dial in the blade I can slap a 3/4” board into the miter slot and bump the fence against it to check it for parallel. Fast and easy.