If a store says they are open 24-7 why would they have locks on their doors?

Because...

• The landlord installed it many years ago, before this 24-hour store signed the lease.
  

• Sometimes, when the clerks work alone, they also need to go to the bathroom.

• So that you can lock down in emergencies, such as tornado warnings, or lock down situations or when they're doing construction.

• They can lock up on holidays such as New Years Day and Christmas.

• For occasional, temporary down time such as inventory control.

• Doors are made that way. They are are manufactured with locks. You can't buy an exterior door that doesn't come with a lock.

• Stores are made that way. In designing a store you need to consider unforseen events such as emergencies or a future change in store hours. Some stores may abandon the 24-7 schedule years later.

• Since it costs practically nothing extra to order doors with locks, why not? It would cost a lot more later to add them in.

• There is an end to every beginning.

• To close down on Christmas Eve night and Christmas.
  

• The store is required to have locks for emergencies like a bomb threat when all customers have to leave the store, and it's closed for a big part of the night.

• Many stores, right after getting robbed, will lock customers outside, so that the police can take full charge and investigate what happened with all that missing money.

• If the store didn't have locks on their doors, the insurance costs would be higher.

• Many large United Kingdom 24/7 shops are not allowed to open on Sunday nights (due to old laws) and so would need the locks to close on Sunday nights.

• Many places lock up, if there is a power outage.

• Some stores used to have regular hours, before they became a 24-hour stores.

• A store may stay in business for a certain amount of time, then sell to someone else who wants locks on the doors.