(Character in exemple is a Ai creation and is not real)
The model will bring in a futurist drone robots that will shave the person's hair to turn her bald. It was trained using female character but should be able to work with male. The results are not always perfect, If hair are really long and fall on the shoulder and chest, the drone might leave behind some hair there. It also struggle if the top of the head isn't visible (cropped).

Prompt i use: A shave-drone enters the picture and swiftly shave the woman's head bald before leaving the out of the shot frame. The woman is left completely bald