Dead key fobs. Cannot enter my licked vehicle. What do I do. No mechanic's key on2007fobs

A 2007 X3 has conventional keys with a remote head. Are you asking about a different year? In case there's confusion, you can find an owner's manual for a 2007 X3 here: https://cdn.dealereprocess.net/cdn/servicemanuals/bmw/2007-x3.pdf Reference page 18 where the keys available are shown.