Use the "Sit" Cue to keep your dog next to you while you check out at the vet or pet store, as a polite way to greet instead of jumping, to prevent running out the door when opened, and any situation where you need to them to be still for a moment.
After practicing a few times with your dog facing you, practice the Sit with them beside you. Sit next to you is more useful than in front when you're out in public with your dog.
Practice on-leash in different rooms inside your home this week. Next week, do it outside with more distractions.