Hello there! Conducting a search of the store is part of store closing duties because it is necessary to ensure:
1. Everything is in place
If things are not in place in a store, things would be very messy when opening the store the next day. Conducting a search of the store to see if everything is in place also ensures that no merchandise was stolen, and if so, persecution would be followed through with accordingly.
2. There is nobody trespassing/lurking
Conducting a search of the store is part of store closing duties because it assures workers that nobody is lurking in the shadows or intruding without the attention of any employee. Trespassing is illegal in most places, and it is a severe felony in some places. Whenever a store attendant is unaware of somebody who is in the store without permission, countless things can happen that do not work in favor of benefitting the business. However, conducting a search of the store during closing time would eliminate this concern.
If you need any extra help, let me know and I will gladly assist you.