Sorry for the delay! Leo will be able to see that the access panel is wired to lock down if there are too many incorrect attempts with the passcode, or if the door is forced improperly. However, with careful examination, he can parse out the proper sequence to open the door through a combination of residual fingerprints left on the panel and the relative simplicity of the passcode itself. It will take a little time, but it's possible. He may run into some interference from the Praonyx that makes up large components of the access panel and the panic room itself, but he will still be able to identify four survivors inside who are highly stressed.