Unless you want a localized earthquake, a flamethrower, a tank, or generalized chaotic violence that would destroy the door rather than seal it, I can't say there's anything that's quite fitting.

[He's stuffing his hands in his pockets again, peering at the door.]

I could ice it up, but... [He spares a glance to the people in the store.] I can't say me summoning ice from nowhere is going to be subtle.