def METHOD_NAME(allFiles):
    key = input('Enter your key (lowerCamelCase): ')
    for keyFile in allFiles:
        with open(keyFile, 'r+', encoding='utf-8') as json_file:
            data = json.load(json_file)
            if key in data:
                del data[key]
            json_file.seek(0)
            json.dump(data, json_file, ensure_ascii=False, indent=4,
                      sort_keys=True)
            json_file.truncate()