2010 Ford C Max 1.8 bonnet release catch?

I'm having great difficulty trying to open my bonnet. The key does not seem to work in the latch and I need to open the hood! Someone suggested I use a long screwdriver but how do I do this. Any advise would be greatly appreciated

On my Focus I have to lightly press the plastic grill down to get the key to work.

Push down on the lid then turn the key.