Lol
Close yourself in a room and block the door space in the downwards of it

Tbh if I'm dealing with having to kill 18 ofthem
Honselty I love to lock myself in somewhere empty(with no ants) (not like I'm gonna, but IT SEEMS LIKE THEONLY BEST OPTION]

Ohh... uhm...
L O C K . Y O U R S E L F ?
Jk dont do it lol
I have no idea on what to do in this case sorry

No but here's the thing
There are ants coming out from 4 directions

Check ur cookie pot
Or ur sugar pot
Or ur candy pot
Or make something to block them from entering