Physical Key Item Exports

These exports work directly with the physical key item layer.
exports.nord_vehiclekeys:GivePhysicalKeyItem(source, plate, 'owner', 0)
exports.nord_vehiclekeys:RemovePhysicalKeyItem(source, plate)
exports.nord_vehiclekeys:HasPhysicalKeyItem(source, plate)
Normally, use 
GiveKeys / 
RemoveKeys instead because they keep permission state and the physical item synchronized.
Use the physical-item exports only when you deliberately need low-level control.