OnInvoke doesn't work with Bindable functions?

InputService.InputBegan:connect(function(input)
for _, v in pairs(Settings:GetChildren()) do
if input.KeyCode == v.Value then
Functions:findFirstChild(v.Name):Invoke(script.Parent:findFirstChild(v.Name).Value)
end
end
end)

function Functions.PickUp.onInvoke(id)
print(id)
end

Error message: OnInvoke is not a valid member of BindableFunction