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If the lock cylinder is reversed, you can remove the handle and lock guard, remove the lock cylinder fixing screw, insert the key and rotate it slowly, and you can take it out.
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Take the vise, you can't change the lock.
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Looking for a professional to help, it's really not possible to change the lock.
It's been a long time, or it's been oiled, or there are burrs on the key. Method 1; Remove the lock cylinder and clean it with gasoline or aviation oil. Remember not to remove the keyhole on the door and wash it down. >>>More
If you really can't fix it, find a professional door lock! This way your lock cylinder can still be kept, if you stiffen it yourself. It is possible that the lock cylinder is also broken. >>>More
You can ask the locksmith to come and help. If you can't remove the key from the door, you can drip a small amount of oil into the keyhole. Gently turn the key to fully lubricate the oil into the keyhole. >>>More
Prepare props: a slot, a Phillips screwdriver, 2 pliers, 2 sewing needles, 1 tweezers. >>>More
Find a lock-picking company, or change the security door!