GUI Event and Callback Assistance

Introduction:

As a moderately skilled coder, I have recently revisited GUIs, and a recent project consists of a simple GUI for turning on a light. Now, I have created GUIs in the past, but they did not feature events, making this project my first GUI to ever feature events in the Callback function.

function Light_Switch(); 

    figure = uifigure('Name', 'Test', 'Units', 'Pixels', 'Resize', 'On', ... 
        'Scrollable', 'On', 'WindowState', 'Maximized', 'Color', 'Black'); 
    
    light = uilamp(figure, 'Color', 'Yellow', 'Enable', 'Off', ... 
        'Position', [600, 420, 300, 90]); 
    
    figure.KeyPressFcn = {@Luminance_settings, light}  
        
end 


function Luminance_settings(figure, Control, light); % Control is the event variable

switch Control.Key % Events are controlled/determined by keyboard inputs
    
    case 'Spacebar'
        
        light.Enable = 'On'; 
        figure.Color = 'White';     
        
end    



end

Program Purpose Explanation:

The main function Light_Switch contains the figure with a UI Lamp object. When the spacebar is pressed, the callback function Luminance_settings is supposed to activate the lamp object via the event variable Control.

Problem

Unfortunately, my coding knowledge does not extend to GUI Callback Events, and I was unable to find sufficient information/documentation of the Mathworks website explaining events involving keyboard input. When executed, the function displays the GUI with the lamp object, but does not respond when the spacebar is pressed. I am unable to determine whether I used the wrong variables, or if the event codes were entirely incorrect.

Due to my course requirements, I am unable to used nested Callback functions for any project involving GUIs. Therefore, my project features separate function and callback function.

If anyone is able to provide assistance, please feel free to do so.

Additional Requests:

If anyone happens to know, can anyone provide some available callback event documentation? Can anyone please provide a detailed explanation about callback events? And can anyone please provide some more keyboard input variables for callback events?