If Snake had time to prep and a few recon drones outfitted with thermal, infrared, and Lego brick detectors. He could scout the house, memorize the floor layout, and identify choke points where Kevin could place traps. He would have to choose a place to infiltrate, most likely from the roof or a 2nd-story window where Kevin won't be expecting him. Only then could he successfully infiltrate. Actually accomplishing his mission (assumed to be killing Kevin) would be a different story. He would have to watch for any traps Kevin could have set while he was infiltrating. Checking corners and conducting a sweep-and-disarm in every room would be an absolute priority. Kevin's only defenses are his traps, so once they are taken care of, the path to him would be relatively clear. At that point, though, Kevin's mom or local law enforcement would probably show up out of nowhere, going from the movies.