Is there a face recognition system that shows that the entrance guard cannot be opened?

The face recognition system shows that the entrance guard is not opened for the following reasons.

1, because there is no input information before, so it can't be recognized before the face recognition terminal;

2. Face recognition needs the support of algorithms. Sometimes, there will be problems with the algorithm and it is impossible to recognize faces. Just like in our company before, because we took the experimental version of the algorithm package, some colleagues failed to pass the data entry.