Alecto studied the door, its instructional text and the cage above. "Electrified", taken in combination with the terms "serious injury and death" were an obvious threat to deter trespassers.
After half an hour of close observation , Alecto noted the lack of activity of the wires in the cage and no visible lock, or other Ancients devised way of controlling the door. She also noted that Deathvine's coin met no ill effect upon contact with the door. Convinced of the facts, Alecto finally touched the door with her sword.
Nothing happened.
With a look to Slade, she and the Human probed the edges of the door. Apart from thick hinges holding the door to the wall, there seemed no indication of lock or obstruction. In fact, the closed door did not look to be secured in any way.
While the unevenness of the chamber floor might slow the door's opening, nothing evidenced that the door would not open or kill the opener.