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This one must have to be locked, and no one will fix it for you.
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It is better to find someone to repair the lock than to buy one and install it yourself, and the repair cost is also a lot.
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You want to change the locks. Repair can definitely be repaired.
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The door may be deformed. Look for repairs to repair security doors.
Is the key original? Configured keys are prone to such problems. Then there's the problem of the lock cylinder - lubricate it with pencil powder. If it doesn't work, just find an installer to debug it.
It is the egg bead spring in the lock that is broken, so it cannot be synchronized with the key notch.
In your case, it is recommended to directly change to a better Grade A security door!
Maybe the lock cylinder is broken, you try it first, put some pencil powder into it, don't use oil, the lock breaks quickly with oil. If you still can't screw it, find someone to change the lock cylinder.
I think it's the insurance closed, you can open the insurance. Then it will open. You can give it a try.