The usual Dominican solution to doors is to have an ironmonger made a door of wrought iron that opens out. These can be decorative and attractive. The interior door will open towards the inside.
I have seen these steel bar doors with a lock installed, but the tradition is to put a padlock on it.
One can buy a large variety of kickass padlocks in the US, and they are portable, and fit in a suitcase, unlike maximum security doors.
On the inside door, you can install a deadbolt. It might not be burglary proof, but it would make it harder to get in than chiseling through the concrete.