LDV CREWCAB TIPPER YEAR 2,000 LOCKED OUT?

I BOUGHT THIS VAN GOT HOME AND LOCKED THE 2 PASSENGER DOORS FROM THE INSIDE THEN LOCKED THE DRIVERS DOOR WITH THE SINGLE KEY FROM THE OUTSIDE THEN I TRIED TO UNLOCK BUT THE KEY WONT UNLOCK ANY OF THE DOORS DOES ANYONE HAVE A SOLUTION CHEERS WILLIAM