car doors wont open?

i have nissan primera se manual 03 Reg. Battery went completely dead a few days ago, today tried to open car door with my remote key, it didn't respond as battery was totally dead. tried to open door manually with the key, it wont open, the key is turning towards the rear but it wont open. Any ideas please as I do not have breakdown cover. Is there a way I can open the bonnet just so that I can recharge my battery?