I would minraise, call the SB and decide if BB shoves. Open-shoving is a bit too much cuz BB has 18BB, and while it can't be too bad of a play it's just better to minraise with pretty much all of your range here. You risk less when you're bluffing and you won't be put in too many tough spots generally. Just keep in mind that if you minraise you can't fold too much to the SB who will be shipping it a decent amount (especially if there's antes). A7 definitely strong enough to call.
