How do you remove thoes magnetic sensory theth tags on cloths ?

How do shop lifter do it ? You obviously have to do it quick and easy so how do you do it lol ? I'm not planning to steal .... It's just an honest question ! If you think I shoplift do not answer this question with rude or stupid comments ok ! Just answer if you .... I'm soacifly asking only people who will give me an answer ! Thanks :)