It's often done as a security measure too. I've worked 3 professional jobs where I was salaried and still had to check-in/out, one was due to the security need

It's often done as a security measure too. I've worked 3 professional jobs where I was salaried and still had to check-in/out, one was due to the security need to know exactly who was in the building at any one time, the other two were overzealous micromanagers.