The guardian must be able to identify people in entry and exit to avoid prohibited and suspicious items, which will allow the guardian to be carried out in a few shifts.
Having a few useful and committed guardian does not reduce security problems, because in this case human error is inevitable.
Access control gate, is a device that is ready for 24-hour traffic control of entry and exit. These gates are connected to the personnel database, which is opened by identifying people and controlling the traffic permit.
Entrance gate of offices and organizations
Having a security guard at the entrance of the office to control the personnel and provide security may seem good in the first stage, but over time, you're having trouble.