Calculate- door about 78 inches x 36 inches (minimum) x 8 pounds Sq. in= 22,464 pounds pressure on that door, holding it against the stops. I would quite happily stand watching as the worlds most strongest man tried to wrestle with that. You don't need interlocks, and indeed most doors don't have them. The plug door has to open inwards first, so you need to defeat that pressure, before the door can be open- not just slide it past the stops to open. The handle mechanism isn't anywhere near strong enough. Makes for good scenes in movies though.