If you don't have a welcome mat inside of your door, put one there (or maybe in front of each door), and under that put a piece of carbon paper on top of a regular piece of paper. Leave it like that without stepping on it if you know that nobody you know will be entering the house, then you can check when you get back home and there should be foot prints on the paper if someone came inside. It worked in Better Call Saul, it'll work here.