These are genius! Have someone link them onto your necklaces, and you’ll be able to snap them closed on your own. (You keep one end of the chain in your mouth with the magnet dangling out, pull the chain around your neck, and let the magnets jump at other. )

They come in a variety of sizes and finishes. Here’s one link: https://m.media-amazon.com/images/I/71wWDdD9V6L._AC_SX679_.jpg