Using ImageJ as a plugin for mass image analysis

I am currently trying to use ImageJ as a plug-in where I can open a file and have the script apply certain settings to it (Image>Adjust>Color Threshold> Color Threshold: B&W, Brightness = 75). I've been able to open the image, but I'm having trouble applying the settings I want. The "Apply" command isn't working and I am running out of ideas. I've attached the code below. Can anyone help?

javaaddpath('C:\Program Files\MATLAB\R2023b\java\mij.jar');

javaaddpath('C:\Program Files\MATLAB\R2023b\java\ij.jar');

MIJ.start;

% Browse for the JPEG or TIFF file

[filename, filepath] = uigetfile('*.*');

imagePath = fullfile(filepath, filename);

% Open the image using MIJ

MIJ.run('Open...', ['path=[' imagePath ']']);

% Open the Color Threshold dialog

MIJ.run('Color Threshold...');

% Set color space to B&W

MIJ.run('Set... ', ['thresholded color=B&W']);

% Close the Color Threshold dialog (applies the changes)

MIJ.run('Close');