Ravens of Eternity
Since Eva was technically the most physically capable of the three, she had the honor of cracking open the door.
She stepped up to it and tried to simply slide it open, but it was seriously stuck. Then Eva cracked her knuckles, found some hand-holds, then poured as much energy as she could into moving the thing.
And with a great heave, the door moved a few centimeters. It felt like it had been practically glued into place, and slid extremely slowly. She surmised there was probably decades-old gunk all along its magnetic slide.
Because it was barely moving, Eva stopped pushing on it and caught her breath a bit.