new Lock[MAX_VEHICLES];
#define COLOR_GREEN         0x33AA33AA

if(!strcmp(cmdtext,"/lock"))
{
	new Float:VX,Float:VY,Float:VZ;
	for(new vehicleid=1;vehicleid<MAX_VEHICLES;vehicleid++)
	{
	    GetVehiclePos(vehicleid,VX,VY,VZ);
	    if(!IsPlayerInRangeOfPoint(playerid,2.5,VX,VY,VZ))continue;
		if(Lock[vehicleid] == 0)
		{
		    Lock[vehicleid] = 1;
		    SendClientMessage(playerid,COLOR_GREEN,"Car closed");
		    break;
		}
		if(Lock[vehicleid] == 1)
		{
		    Lock[vehicleid] = 0;
		    SendClientMessage(playerid,COLOR_GREEN,"Car open");
		    break;
		}
	}
	return 1;
}

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
	if(Lock[vehicleid] == 1)
	{
            ClearAnimations(playerid);
	    SendClientMessage(playerid,COLOR_GREEN,"Car is closed");
	    return 1;
	}
	return 1;
}

if(strcmp(cmdtext, "/engine",true) == 0) {
	    if(GetPlayerState(playerid) != PLAYER_STATE_DRIVER) return 1;
	    new engine,lights,alarm,doors,bonnet,boot,objective;
        new vid = GetPlayerVehicleID(playerid);
		GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
	  	if(vid != INVALID_VEHICLE_ID) {
	  	    if(engine == VEHICLE_PARAMS_ON)
	  	    {
	  	    	SetVehicleParamsEx(vid,VEHICLE_PARAMS_OFF,lights,alarm,doors,bonnet,boot,objective);
  	    		SendClientMessage(playerid,0x828282FF, " stop engine...");
			}
			else
			{
	  	    	SetVehicleParamsEx(vid,VEHICLE_PARAMS_ON,lights,alarm,doors,bonnet,boot,objective);
  	    		SendClientMessage(playerid,0x828282FF, " start engine...");
			}
		}
	    return 1;
	}

public OnPlayerExitVehicle(playerid, vehicleid)
{
    if (Lock[vehicleid] == 1)
    {
        new state = GetPlayerState(playerid);
        if (state == PLAYER_STATE_DRIVER)
        {
            Lock[vehicleid] = 0;
            //SendClientMessage(playerid,0xFFFFFF,"Your vehicle has been automatically unlocked.");
        }
    }
}