How do you break into a 2003 Toyota Corolla that you locked the keys inside?

You call a road side assistance service. For a minimum fee, they'll open it. Otherwise, if you try to use illegal tools like a Slim Jim and so on, you risk calling attention to yourself and, more importantly, risk damaging your car. Let the pros do it for you.

After that, you could join such a service for a low fee per year (less costly than a per call fee), they could provide battery boosting if your battery is dead, emergency fuel delivery if your tank is empty (faulty fuel gauge), opening your locked doors when keys inside, changing a flat tire, and all sorts of neat services for you.