If he used a bump key, would my key then not work? I am wondering if he does come in when I am not here, could I tell from the lock?

Answer (1 of 2): If a bump key is used correctly it does exactly what hand picking or using a picking gun does, only faster and less skill involved. It simulates what your keys does by creating the correct combination of cylinder and housing pins to create a “shear line” this allows the cylinder

French Keys

Is a key lock or number lock better? - Quora

Are newer, well-made locks less susceptible to bump keys? - Quora

Bump keys Red Key LLC

How Do Locks Work?

These Are Things Man Was Not Meant to Know - TV Tropes

How do key-copying kiosks like MinuteKey and KeyMe know if a key is not supposed to be duplicated if you only insert the tail where the peaks and troughs are? - Quora

Can a bump key open any lock? - Quora

Would a bit of nail polish hurt a key lock? My husband has mild dementia and can't remember which key is for the door. Would a tiny bit on the end hurt?

I have an old Medeco key. Can I get a duplicate made? - Quora

7 Things That Won't Happen When You Switch to Mul-T-Lock — A Locksmith Naples

Why cuts are provided in keys? - Quora

Why do I always lose my keys? How can I prevent it from happening? - Quora

How to make your deadbolt resistant to bumping, raking, and picking - Arcady Genkin