[maramizo]

My guess would be you have the array PlayerInfo assigned to MAX_PLAYERS with enumerator of pKeys.
So it would go.

pawn Код:

OnPlayerExitVehicle //bla bla
Lastcar[playerid] = vehicleid //bla blah
CMD:lock(playerid, params[])
{ 
     if(lastcar[playerid] != PlayerInfo[playerid][pKeys]) return SendClientMessage(playerid, COLOR_WHITE, "You do not own that vehicle.");
     else
     {
             //lock
      }
      return 1;
}