can anyone tell me how i get back into my mk1 focus. i was sanding down the rear wheel arch when the doors locked themselves

. rather stupidly i left the keys in on the dashboard. i really need to get back into the car, as i have a baby who is due in under 2 weeks and have another mk1 focus to repair within the family. Please if anyone has a clue on how i can get back into the car without smashing a window it would be a great help, as have no breakdown and cant afford a locksmith and i really do want to avoid smashing any window as all my local breakers are closed for the Christmas new year period.