So a key holder is usually a member of management that is called out in response to an emergency or alarm activation. 

This vital security service can be carried out by a security company. It would involve them holding a set number of keys so that they can respond and react quickly and take action to protect your business. They are available 24 hours which is more crucial as intruders get smarter, more creative and faster. It can also be comforting to know that your business is being protected at all times of the day and night. A highly trained professional can respond to an intruder, they protect you and any employees. They will prevent disruptions to your personal and professional time, saving time, reducing the need for staff availability and reducing costs. Delegating the responsibility of key holding to a professional and trusted company can also negate tensions with staff around key holding.