The best place to start is look at the type of business you have and do you have customers wandering in through the front door. Shoplifting happens everyday and retailers lose millions because of it. Ask yourself these questions and it should give you a good idea of what areas of security you need to look at.
• Type of business? Retail etc.
• Who enters the business premises? Customers, delivery drivers etc.
• Business premises condition? Doors, windows, locks all in good order, CCTV work and connected?
• How long are the premises left unoccupied?
• Which staff has access to which part of the building and do they need it?
Once you have identified these, you are in a better position to tighten vulnerable areas. As you can see it is complex, so consider contacting a locksmith or security consultancy, as it is easy to miss an important aspect when conducting an assessment