I’m a retired physics teacher, & I can tell you how to use those magnets on a stick to get thrown out of a Lowe’s! (If they didn’t want us to play with them, they would lock them up, right??)
I've found a few pins, maybe from my mom’s sewing things, that aren’t magnetic. Using the magnet to pick up
stray pins will work IF all the pins are magnetic, so have everyone check the pins they plan to bring.