NNDist( !ToBreak!, !FID_LicTypesZIP!, !MIN_ToBreak!, !NNDist!)

def NNDist(ToBreak, Customer, Minimum, NNDist):
    for Customer:
        for ToBreak:
            if ToBreak>Minimum and ToBreak<NNDist
                return ToBreak
            else:
                return -1