The heck with garlic butter!!
Go to your local hardware store, obtain a big flat-face hammer, paint it orange, and use only that hammer wearing workgloves since there is a health hazard, to smack the heck out of these things!!! They can’t make more of themselves when they are squished!
Or, get a 5 gallon bucket with a top .... fill it a little more than half full with water, and add in two small boxes of kosher salt. Knock the snails into the bucket, until there is a possiblility of sloshing the water out of the bucket. Snails and salt do not mix. empty the bucket in the appropriate sidewalk drain.
Gonna need a bigger hammer.........