Depending on the circumstances you may need more than that. A shotgun and an assortment of shot/slugs might be good to include in your planning.
Contrary to urban legends (and fictional entertainment), in times of disaster humans generally pull together:
The guns were used to protect houses and the neighbor's house though. So this could well fall into what you meant by useful in your home. (but if that is what you meant locked shouldn't have been added)