Use a Persona ability.

“I could try to use a Persona ability to get you in,” Makoto suggested.

“What, like a spell? I think the door resists them. “Garu!” she exclaimed. A blast of wind struck the door. It glowed faintly, before sending a wave of air pressure back, bowling Makoto back. Yukari stood her ground and braced herself, but not before the gust lifted up the hem of her skirt well above her belly button, displaying her slender legs and lacy pink panties. With a yelp, she yanked down her skirt, glaring angrily at Makoto.

“That wasn’t my fault!” Makoto insisted, panicking and backing off. “Anyway, could you just teleport inside?”

“You can do that?”

“I think so. Um, here goes!”

Yukari felt a soft glow envelop her. Her uniform began to glow as well, before she vanished.

“I’m in the storage room!”

“Great, let me in.”

“I-I can’t!” Yukari’s voice sounded suddenly panicked. There was a long pause. “My clothes are missing.”