The material of your door should be build out of very tough materials, and maybe even have an internal cover plate to reinforce its strength. Aside from these, your door may need an external steel plate to shield it from blows, especially around the door lock itself. Your door frame should be pretty durable too, meaning it cannot be easily broken or wrecked by an intruder. The door frame must also be difficult to take apart by being fixed against the wall.
The door locks you choose should be selected based on the type of door you are using and how much you can pay for your door locks. It would be ideal if you can get a minimum of two door locks, which can not be easily opened by lockpicks or simply broken to allow entry to intruders. The electronic locks can complement use of standard door locks. You should situate your access panels for the keyless door locks you choose at a safe distance from openings like ventilation shafts.
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