How do you get bonnet opened when key won't?

If the bonnet won't open with the key, try using the manual release lever inside the vehicle, usually located near the driver's side footwell or under the dashboard. If that doesn't work, check for a mechanical linkage issue or blockage in the latch. You can also use a flathead screwdriver to gently pry open the latch mechanism, but be cautious to avoid damaging the paint or components. If all else fails, consult a professional mechanic for assistance.