From what i've seen with Dylan Shuttles SGE and SGE_v2 for ERP, the lockdown doesn't have a backup plan. Meaning, if someone presses the lockdown button, then disconnects, the only way to unlock it is to restart the server. Now, there probably is some super secret that only he knows to fix this problem, but i just thought id say:
If you do have a lockdown, iris, or something of the sort, HAVE A BACKUP PLAN just incase things go wrong.
Maybe something obvious, such as a second button that cant be blocked, or something as complicated as a series of teleporters that will take you to the room.
Just a warning