1998 Renault Megane Hi Day Yesterday Car Fine 8pm Went Out Would Unlock By

Hi, all day yesterday my car was fine then at 8pm I went out to my car and it would not unlock by central locking , so I opened door by my key, the car has a mobaliser so there for I could not get it of to start my car ? Do you no what I could do please ? This then result in me having to get a taxi to were I wanted to go please help ? I have also tried keeping my finger on the central locking buten in the car as the web said this will come of if I do.
Thanks