For most people, the security of their place of residence and job is paramount, and is irreplaceable. Commercial establishments and other facilities are open during the day when people work and customers enter.
This meant that the door had to be opened for people to enter. However, some doors only allow authorized people to pass through. For this reason there are access control systems specifically installed to check incoming people.
Access control mechanisms can be physical or electronic. The door can be locked manually to prevent outsiders from entering the restricted area. The computer system can be used to activate the electronic locking system.
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There are many companies that offer services such as electronic locking and security system installation and there are security systems that use both physical and electronic activation / unlock systems.
For example, the door can be opened with an access control card that simply passes through the card reader. This type of access control, which uses cards instead of keys, is becoming more common. In fact, it is the most commonly used form of electronic door access in many restaurants.
This does not mean that the keys are out of date. Even so, hotels and laboratories use cards as door keys. Access cards have a magnetic strip that can be read by electronic readers on the door. Facilities with high security areas will use an electronic lock / unlock system to prevent the entry of unauthorized personnel.