folding is fine, with a few more short stacks, you could minraise with the intention of calling the shorties.
also if you have marked regs, you could minraise with 15 bbs to rep the nuts, and fold to a shove/3bet etc.
but if you dont wanna play difficult, just fold, its completly fine too
i personally dont really shove anything at this spot with 15 bbs, only middle pairs, everything else i minraise : P