What kind of doors require passengers to operate them physically?

Manual doors require passengers to operate them physically because they do not have any mechanical or electronic systems to assist in opening or closing. These doors typically swing open or slide aside when a person pushes or pulls them, necessitating human effort for operation. This contrasts with automatic, electric, and sensor-activated doors, which either function through a motorized system or through sensors that detect motion, allowing them to open without direct physical interaction from passengers. Manual doors are often used in environments where simple, cost-effective access is required, but they require users to exert effort for use, making them distinct within the broader context of door types.