Theres not always a keypad. There was no number pad to key a pin in where my wife used to work. It was the hand or nothing. She left for other reasons. To be “safe” I guess he could have used the left hand. Its the right hand or the forehead that Revelation speaks of. He must not have wanted to take a chance.
We use our badges, just place the back of our badge in front of the reader and click door opens.
Where did she work? FRmail welcome.