Descend and land. You’d have done that long before “starting to enter” restricted air space. Otherwise enjoy your fine and potentially losing your license once the FAA finds out.
It’s like not you can accidentally enter restricted air space. You know you’re going to be entering the airspace long before you get there so there is plenty of time to take action.
Small airports aren’t really an issue tho. FAA won’t come after you for that. But you should always know where you are, where the restricted air spaces are, with a plan to avoid them. If not you’re fucking up as a captain.
Restricted airspace’s are there for a reason. It’s for safety and not paying attention to them has consequences.