OK...I've tried searching and couldn't find this exact problem. If I've missed it...sorry

My key locks and unlocks both doors just fine using central locking. It sounds like the trunk unlocks but it will not open. When I use the key in the trunk, it continuously clicks when turned, but still will not open the trunk lid. It was working fine just a few day ago...the last time I was in the trunk. I'm open to ideas or suggestions. Also, my seats do not fold down so I'm not sure how to get into the trunk to try and release it. Thanks