Your best bet is to by a new lock set costs around £60/70 and comes with all new locks and keys.
As you will need 3 keys cost £20+ each if you have to key number.

fit the locks yourself then you have to get it programmed

i A ford dealer will charge about an hours labour just to progamme and you have to tow it there a cheaper option is to call out a moblie auto elec as this would be cheaper