I honestly have no ideas myself, unless you think there'd be any way for them to find something lying around that they could potentially jimmy the door open with (ok that pun was slightly intended)

BECAUSE other than that they could always use brute force by way of Pokemon, but depending on who's been battling the grunts that might be a problem if the rest of their teams are potentially wiped. Something I'll add that might be helpful if they do just have to bust the door down- Jimmy's actually pretty dang strong for being a literal noodle person, so if he worked with someone to try and break in there that could possibly work.

But in the end I'm literally cool with anything, and open to all the ideas