COUPLE OF CLARIFYING QUESTIONS. before they give up, since they'll probably need help (or Jason will build a bomb):

1) Is it magically sealed? Peter is basically the Marvel Superman. (Sit down, Captain America)
2) What type of lock is it? Jason has plenty of experience breaking and entering, both from childhood and from training he's received as an adult. Because Batman is famous for his warrants on suspects!

Related, what's the structural integrity of the tunnel around it?