Clio battery flat and car won't open

[oldmanbm]

My daughter left her 06 Clio (old shape) for a week and when she came back it had locked her out. The remote won't work and the silly only a keyhole on the passenger door doesn't do anything when turned with the key. To me it seems as if the battery is flat and there is no power to run anything. I cannot get in to open the bonnet to charge/replace the battery. Really not sure what to do next except find a way into the car and open the bonnet.