The Garage Threshold, and the Five Minutes Before the Car
Kneel at a closed garage door and look along the bottom edge. If you can see the driveway, so can everything that lives in the driveway.
The stop
The garage is the biggest opening in the whole perimeter and it opens and shuts more times a day than any other door on the property. The rubber seal along the bottom of the panel takes every one of those cycles, and on this house it had gone flat at the corner nearest the side wall. A band of daylight showed under it, about the thickness of a pencil. That is enough. A mouse does not need a hole; it needs a line it can follow and a gap at the end of it.
Mice travel along walls. They do not cross open floor if they can help it. So the first thing I do inside a garage is walk the baseboard with the light low and look for the dark smear a body leaves when it brushes the same path every night, and for the small black grains that confirm it. This garage had both, running from the flattened corner of the seal to a stack of cardboard boxes against the back wall, where the family kept holiday decorations and the dog's food in its original paper bag.
The cardboard and the paper bag are the real problem; the gap under the door is only the route. What I do is replace the seal and the side weatherstrip, put the dog food in a lidded bin, get the boxes off the floor and onto a shelf so the wall is bare, and set a station in the corner where the run was. What I ask the owner to do is sweep the floor once a week and keep it clear, because a clear floor has nowhere to hide and a mouse knows it.
The note
While I was on my knees at the seal, the owner came out of the house through the door that connects the kitchen to the garage, got into his car, and the roll-up door went up and down behind him. He had gone from his bed to his desk without once standing under open sky, and he would come home the same way. For a lot of men that door is the only threshold they cross all day, and they cross it sealed inside a car.
I have no opinion about anyone's schedule. I do have an observation from a lot of driveways: the men who look the most tired at eight in the morning are the ones who have not yet been outside. Research has looked at what a few minutes of daylight early in the day does to the body's sense of what time it is, and the brief of it is that the eyes and the skin seem to use morning light to set the clock the rest of the day runs on. Some men notice that the day lands differently when the first thing it includes is the sky rather than a windshield.
So here is the threshold habit, which is what I would do with that door if it were mine. Keep the shoes by the door that leads to the garage, and put them on there, not in the bedroom. Before the car, walk to the end of the driveway and back, or stand at the mailbox for five minutes with nothing in your hands. If there is a dog, this is the dog's five minutes too. In the evening, do the same thing in reverse: get out of the car, close the garage, and stand on the driveway for a moment before going in, so that whatever rode home in the car stays in the car.
The seal was mine to fix, and I fixed it. The five minutes were his, and I do not know whether he took them. The note is here for the next man who reads it with his keys already in his hand.
Worth asking a doctor about
If a walk to the end of the driveway and back leaves a man short of breath, dizzy, or with any tightness in the chest or arm, the walk is not the problem and this note is not the answer. That is a same-week conversation with a physician, before the next walk, not after it.