A very short animated clip

Using the attached picture as a template, I would like someone to create a video of a similar gate which will simply open upon the click of a button. This video will be used as the landing page for a website I am creating and upon the gate opening the visitor will then be re-directed to the home page of the site. More information can be provided later I am creating a website whose landing page I want a closed gate. When the visitor clicks on the "Learn More" button a video should be triggered during which the same gate will open slowly, resulting in a flash of light and redirecting the visitor to the home page. This is the context of the work. All I need from you is to create a video of the gate which I would like to resemble the picture attached. Everything else I can take care of myself. Let me know if that is clear enough or if you need any more information. Many thanks.