My mother used to give me an empty mayonnaise jar, and then would pay me a dollar if I brought it back full of snails and/or slugs. She then filled it with rubbing alcohol, put the lid on it, and put it in the garbage can.
Otherwise, geese do an excellent job of controlling slugs, snails and bugs as well as weeds (hence they are called “weeder geese”). They have the advantage that the diet makes them nice and fat so you can have a proper Dickensian Christmas feast. While still alive they also make excellent watch dogs and burglar alarms combined in one entity.
Unfortunately, they make a large amount of noise, bite your friends when they visit your garden, and are incapable of telling the difference between a weed and a plant.
So small children, empty jars and cash money may be your best bet.