Start with getting out. The Queensland Fire Department tells households to have one common key for all door locks, or to install locks that do not require a key from the inside, to choose window security screens that can be opened from the inside, and to show all occupants, including overnight visitors, how to escape through security doors or windows if an emergency occurs. That advice is written for every household, and it is not an argument against fitting a security door. It is an argument for asking about the internal hardware on purpose instead of accepting whatever arrives on it.
Then the door already hanging there. The jobs this business is called out for are named on its own repairs page: a door that will not lock or close properly, a broken handle, a key that jams, and sliding doors that roll incorrectly, jam, bounce, fail to close or jump off the track. All of those are repairs, done onsite. That matters more on a beachfront street than it does inland, because corrosion rarely shows on the mesh first. It shows as a mechanism gone stiff, and Cairns averages put 9am relative humidity around 72 percent, so salt landing on hardware does not stay dry.
One further reference point, and it is guidance rather than a rule for a private house. Assistive Technology Australia advises that lever handles are preferred over doorknobs, because a doorknob does not give an adequate grip to a hand with impairment, that a handle should be shaped so the hand of a person who cannot grip will not slip off it while the latch is being operated, and that D pull handles are preferred on sliding doors. That is an independent assistive technology authority describing generic hardware, not a compliance requirement on a house, so treat it as a yardstick to hold a handle against.
Everything here is made to measure rather than pulled from a stock size. What this page cannot tell you is which internal release hardware, handle type or keying arrangement will be available on your door. So each of those belongs in the conversation at the measure, as a question to put to any supplier you are asking for a quote, including us.