The switch to open/close the nose door is outside the airplane, right next to the nose door. You'd have to blind to close it on someone, and deaf not to hear their screams.
The airlines I have worked at both required that you open the nose door during pre-flight to check for gear/ADG PINS (unless another crew is turning over the plane).
It could be a safety issue if the external switch is mis-positioned while the hydrualics are off...nothing will happen until a pilot switches on HYD 3 (from the cockpit), at which time the nose door will operate with no warning.