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If the inside key is flat, the outside can be pushed in, if it is oblique, do not find a locksmith only strong fold.
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It's good with detergent. A small tube is usually dispensed. Spray a few times, as it should wash away the impurities and try again.
You can idle 、、、 without hooking the hook
An anti-theft door can only hold one key in a lock cylinder, and you can only call the lock picking company to open it for you.
Please do not insert the key inside the security door, otherwise you will not be able to open the door if you have a key outside the door.
Generally speaking, they cannot be opened, because their emptiness is a connected hole, and if there is a key inside, the outside key cannot be inserted (not all of them).
The anti-theft door is generally a lock cylinder that can only hold a key at the same time, you have a key inserted inside, and the outside must not be opened, now you can only find a way to pull out the key inside or knock it out, or find a lock company to open the door.