[With Ren giving him space, Masato moved over and tried the handle. A few turns and even jiggling it didn't seem to help.]

Is it jammed?

[He tried throwing his shoulder at the door, but the most he got was a thud. Still nothing, even after a second try. With that, he turned to Jinguji.]

Try knocking loudly on it. We need to see if someone's out there to open the door for us in case it was locked by mistake.