The only option he had was to remove the cylinder and replace it. The engineer tried to remove the glue using various techniques, but it was dry and had hardened to the point it could not be removed.
In case of emergency break glass, to get key, to open box
The blade goes in easier that way and can hook the key more easily.

How to get a broken key out of a lock with glue. Then you have no option but to drill it out and replace it, mandlebaum says. So, get your hot glue gun and apply a bit of glue on the visible key end. 6 simple ways to get a broken key out of a lock.
Dont try to put glue into the lock. Can you remove a broken key from a lock? According to bill mandlebaum, the best way to ruin a lock is to put glue on one piece of the broken key and then reinsert it into the lock believing it will bond with the other piece.
Way out of the lock you can use your fingers to pull the rest out once you can get a firm grip on the remainder of the key. Bent the paperclip into a straight line and insert it into the keyhole slightly above the broken key fragment. Once removed you can insert a paper clip, or other small rods, into the back of the lock to push out the broken key.
Wait for the glue to dry. It is ideal for the situations when part of the key is sticking out. Once far enough into the lock, twist the paperclip downward to grab the back of the key.
Attack the key from the backside of the lock by pushing the key through to the side on which it is broken (it isnt usually easy to pull the key out from the front). If it broke at the head, you must get a screwdriver to turn the lock back into position to allow the key to slide back out. Needle nose pliers, small scissors or tweezers should be carefully placed along the sides of the key, gently pinched and then pulled out slowly.
Insert the key extractor along the largest cut of the key and make sure the hook is facing upwards. A professional key extractor or the jigsaw or hacksaw blade will also be inserted next to the key, then slightly twisted and pulled to catch the hook on the teeth of the key. Wait for the key to dry before taking hold of the glue.
The backside of the cylinder will have holes that you can poke into to push the key out. However, it works only if the broken key is sticking out. All you need is to glue a part of match stick or some material with the part of broken key and pull it out slowly.
That would seal the key in. All you will need is to charge your phone to the point where you can control the lock. Once it's caught on the key, pull straight outwards to remove the key.
Apply a small drop of the glue to the end of the object you are using, removing any excess glue that could stick to the lock itself, and press it gently against the broken edge of the key. You might be able to do this without unplugging the phone if the outlet is near the lock or if the smart lock uses wifi. Using a hot glue gun, apply a small amount of glue to the end of the key.
The only difficulty to fix broken car keys this way is that you will need a new battery. A broken key in a lock can feel like an emergency, and your first instinct might be to call a locksmith. If the key has snapped and no part is visible, youll need to use a different approach.
You can get the key out of the car door lock using tweezers, hacksaw blade, key extractor, super glue, tapping the cylinder, or pulling the key. Removing the key will depend on the tool. To get the key out, place the blade in the keyway in such a way that the serrations are pointing towards you.
Be careful not to push the key further into the hole while doing this. Before using any tools, try tapping the lock, which may help the key slide out with just your strength and a lubricant. Bear in mind that this method will only work if the broken key is sticking out of the lock:
every locksmith has seen this multiple times, and all it does is bond to the lock. Immediately after you've applied the glue to the end of your toothpick or metal wire, carefully place the end of your extraction tool against the edge of the broken key. To use this method for broken key removal, first find a small object that can be inserted into the keyhole such as a paperclip or bobby pin.
Once it has firmed up, grab the glue blob and pull it. By snapped off end, i mean the base part that you hold. You may need to try multiple times because getting the key out in the first attempt may not be as easy.
Often tackling the key from the front can push the key further into the lock. Once you go through these methods, finding the solution will become easy. Once the tool is firmly against the key, you'll need to wait for the glue to cure.
Look at where your key has broken. When you pull out, you may need to pull hard for obvious reasons. Insert a screwdriver into the lock, and turn it back to its default vertical position.
I will go into the details of all these methods below. Put a tiny dab of crazy glue on the snapped off end of your key, insert into lock, wait a few minutes, remove. Make sure you can get as much contact with the key without pushing the key further into the lock.
The broken key should come right out. Tweezers are one of the most common ways to get the. Then reassemble the cylinder and the lock.
Make sure your lock is in a neutral position to release the pin tumblers holding it in place.
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