I'm struggling to start the car as the engine won't start. It seems the steering wheel is locked
Sounds like the steering lock has kicked in - this is a common anti-theft measure that most cars have in one form or another.
Usually you can free this by jiggling the steering wheel slightly as you try and turn the key.
Try pulling hard on the steering wheel in one direction or the other, it should move about a quarter of an inch. While doing this, turn the key. This is a vehicle antitheft measure.
There is a possibility you moved the steering wheel a bit when the car was turned off. This can cause for the steering wheel to get locked. My car will automatically go on the steering lock when the steering wheel is perfectly straight, otherwise I have to wiggle the steering wheel a bit and hear a click --> this indicates the steering wheel is now locked.
Just wiggle your steering wheel whilst trying to (gently!) rotate your keys. The steering wheel lock should unlock.