Workplace security can mean a number of things depending on what industry you are in and what your workplace premisses are like. For example, if you own a shop then you may need different security than if you own a busy which is office based. A shop will need to ensure that their premises are secure when the shop is shut but having security shutters, alarm systems, CCTV and security doors. When they are open they may also need to still have a high level of security especially if they sell high end good such as expensive jewellery or equipment. If this is the case, they may decide to hire a security guard who will stand on the door or watch over a live CCTV system. They may also need to have security glass installed and lockable display cabinets.
If you own a business that is office based then you will need to ensure that all of the office equipment is protected when everyone has gone home. Again, you will need security doors and shutters and alarms and CCTV systems but you also need to ensure that any data that is being stored on the computers or servers is backed up. If any of the data is sensitive such as card details, personal contact details ect then this will also need a high level of encryption.