1. Type of key?
The brand is Phillips but they make various types. The type here is (not sure of the correct jargon) without vertical ridges and notches. And both sides of the key are identical.
I've looked at some diagrams of key types and I'm not sure exactly. Is it a "dimple key"? Something else?
2. How to remove broken part from lock?
Location: Door between bedroom and garden.
Situation:
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Someone bent the key a little, and it was stuck, couldn't get it out. On the inside of the door. At that point still able to lock and unlock from the inside only. Using other key from the outside does nothing, doesn't even turn.
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I tried gently straightening it but it immediately snapped.
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Now: can still open and close the door using the handle. Can still, with difficulty, lock and unlock the door (from inside only) by carefully pressing the head of the key against what is in the lock and turning.
A lot of info online for removing broken key blades from locks are for the "traditional" kind of key with vertical ridges and notches.
I have a screwdriver that fits all the screws and I can access all sides of the lock (inside, outside, edge), but I'm not sure if that's relevant. I've tried tweezers but it's too snug.
If I need more tools or equipment, I'll get them tomorrow.
Why wouldn't you just replace the whole lock?
This. Some people don't realise how ridiculously easy it is to change a lock when you can open the door with a key.
Put the working key into the lock
Undo this screw
Turn the key slightly back and forth whilst pulling the cylinder out until it starts to come out. Then just pull it all out.
Mark which side was front and back
Measure from the middle locking mechanism of the cylinder to the ends.
Find a lock with the same lengths. It'll be like 60/40 (100mm total length).
6b. Optional: get one with a fixed turnkey on the inside.