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It may be that the position of the door installation is not accurate, there is a small misalignment, and the lock is blocked. It is also possible that the water will get wet and the resistance of rust will increase, so you can drip some car oil on the part of the lock and the keyhole to reduce the resistance, and give it a try. Maybe it will be solved.
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It should be that the hole is not aligned, you press the door properly inside and then lock it.
See what is causing it, if it's not an external factor, you can file it.
It is normal for the automatic lock of the security door, otherwise how can it be called an anti-theft door? But if the security door is automatically locked and locked, then the most important thing to pay attention to is to see if your security door is in the mechanical setting? Is there anything wrong?
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Yes, ask the locksmith to change the position of the pin in the lock cylinder and match the key.