You can put a jar partially in the gravel, throw in an algae disc, turn the light out and you should have a good population in the jar the following day. Good luck.
trap them on a regular basis and sell/give away the snails you catch to people here who want them! also, keep a close eye on your plants, glass, rocks, filter, etc for egg clutches- for pond snails/rams, little clear gobs of jelly which will likely have tiny white, brown, or mostly clearish dots in them. gently scrape them off and squish them or toss them in the trash if you don't want them, or better yet- send them with snails being sent to someone who wants them.
if you don't want them in this particular tank but wouldn't mind them in another of your tanks, i'd say just toss them in the tanks you'd accept them in. no sense in killing the snails just cuz you don't want them there... it's not their fault they're there, after all
If you truely do not want those snails, get 2 or 3 assassin snails. They cleaned out my overrun 29 gallon in two weeks, and they have not bred so I am not overrun with them.