Aw, well, more opportunities to get the wares/inventory mixed up Maybe it starts with a kid finding something they shouldn’t have found?
“Mommy! Mommy! What’s this?” followed by shrieks?
If I were writing, I’d more likely start on the kid friendly side TBH. Unless it’s horror, and start with an employee getting an anonymous threatening letter “I know where you work, you defiler.”
If you’re still undecided -- create two files, write one from the kid-friendly side to start, the other from the adult-orientated side to start. See which one you like better as an opener. (And you’ll have some seed material for the second chapter too.)