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

Why You Shouldn't Attach Any Other Keys to Your Ignition Key

249] What Are Skeleton Keys and How Do They Work?

How does one change the key in an old fashioned type lock? - Quora

How to remove a lug nut lock without a key - Quora

Do all Schlage locks use the same key? - Quora

Do all Schlage locks use the same key? - Quora

How to fix a broken Schlage keypad lock - Quora

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

How to remove a lug nut lock without a key - Quora

4 Types of Lock Picks & How to Use Them - Zero Day Gear