Vehicle having biometric authentication sensor

An authentication system configured to be attached to a door and configured to authenticate whether a person is permitted to open the door. The authentication system may include a casing configured to be attached to the door, a device configured to generate a signal indicative of the person being authentic, and a protection member that is movable relative to the casing and is configured shield the device when the protection member is located at a first position and expose the device when the protection member is at a second and different position, wherein the protection member is configured to receive a first axial force that moves the protection member from the first position to the second position to expose the device, and receive a second axial force that moves the protection member from the second position back to the first position.