Many of my post ideas start with lunchtime discussions. This one stems from a remark that one of the girls made to the effect that if you eat too many poppy seeds you can fail a drugs test. She says that a doctor friend of hers told her this.
Since virtually all bread, burger buns, etc are covered in Sesame seeds these days, it should be possible to open doors without actually touching them.
Try this with the doors of your local supermarket. It really works.