Central locking broken

[Olg8]

 

Hi everyone, my key on my focus mk2.5 has stopped working. I have changed the battery and tried doing the reset thing by turning the ignition on and off 5 times quickly, that resulted in a single beep and when I pressed one of the buttons a few times for the next step I got nothing. I tried holding the button, I tried pressing the button repeatedly a few times, I tried it in the ignition and out of the ignition, but still got nothing. I lost my normal key yesterday and this is me using my spare so don't know if the key is simply broken. As I remember though my original key slowly decided to gradually not want to unlock it from distances. Any help would be appreciated!