Of course, having the dual function, the salary, if not duplicated, should be close, which benefits both the employee and the company. This may be possible as long as the company is small, otherwise it is not convenient because the employee would neglect one function to perform another.
There are countries where there are still a large majority of businesses that use manual doors, that is why I asked the question. I understand that in many countries they are more up to date with respect to it. But I agree with your publication "the doorman or security guards" must open the door.