Stores need people to stock shelves, You usually don't interaxct with customers and work mostly on your own.
Unless your dog is well trained I would recommend not getting a retractable leash, dogs can easily go onto the road and get hit by a car because you have no control over them.
This site has the top rated five on the market. You may have to click it a couple of times as they throw an ad in pretty quick but I got to the site itself. Also, Amazon has quite a few of them and they are all rated.