They do not have to be able to read the entire resume in six seconds! The first time they look at it, they look at it for six seconds. They will read the Summary of Qualifications at the top, and then quickly scan for names of employers, job titles, and dates of employment. IF you make it past the first reading, they will read it more closely the second time they look at it.
The resume should probably not be longer than a page and a half for most people. Start it off with a "Summary of Qualifications." But, write this section last (because it's easiest to write by reviewing what you wrote in the rest of the resume). It contains "the best of the best -" whatever they MUST absolutely know about you, your skills, work ethic, etc. Use bullets in this section, and in the "Experience" section.
The Experience section should contain work history, It can also include volunteer experience. Follow this with an Education section.
The key to making the resume shorter is to start with the lengthy/wordy resume that you have, and look for ways to express the same idea, but with fewer words. For example, I looked at one where the person had listed "dusted the shelves, swept the floors, vacuumed the floors, mopped the floors, cleaned the windows, cleaned the bathroom." That can be reduced to "cleaned the store." However, I would prefer to see "Maintained the store in a clean, safe, and inviting manner." Not so short, but it conveys so much more - a concern for safety, and a recognition of the importance of catering to the customer.
Also keep in mind that the resume is not an autobiography. They don't need to know everything you've done - what they want to know is if you can do their job, and do it well. So if certain things are not relevant to the job you are applying for, you can leave them out. Most people have a "master" resume, and tweak it by making minor changes each time they apply to a job. The job announcement is your guide to what the employer wants to see on your resume.
I don't think we are supposed to "connect" on this site. If you want to connect with me on LinkedIn, I will be happy to review your resume for you!