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If you can't open the outside with the handle, you can open the inside, that is, the strip inside is not installed, the key can't be opened, the lock body can be broken, or the lock cylinder is not installed.
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There is no installation OK or lock body problem.
It depends on what kind of security door, some can't be opened, and some can be opened. You'd better take a picture.
If there is a key inside, it can also be opened. The kind you mentioned, there should be one, but it's not easy to find. Because after all, it is not safe, for example, it is more dangerous to put children indoors.
It should be that the handle is not installed properly, first loosen the screws of the cover and try to install the handle if you can.
will remain in law
If you are sick, you can't cure yourself, so you can only go to the hospital and be slaughtered. It's the same if you have a problem with the lock, who can't figure it out yourself.