peugeot 206 1.1 lx v reg 1999 central locking?

Hi
can sit inside car, doors closed push either drivers or passengers door and all doors locks,however still sitting in car use key fob remote door locks bounce,this is how i lock car, go inthru passenger door push down drivers door button close passenger door then press key fob locks remaining three doors, sorry meant to say its a 5 door come back to car press keyfob doors open except drivers door both front door locks seized so can't test them