For a week lock up the back room.

Make sure its empty first! Make everyone who would work from the back room at any time do their work at the counter or on the shop floor.

Yes, I know some will say it’s not possible. Try it and see what the shake up brings.

Too often, the back room is used as a refuge by people who don’t like dealing with customers.  Retail is about dealing with customers. Place yourself and your employees closer to them and you have got a better chance of serving their needs.