Electrics on mini van

My Ford Windstar 97 will not start. It's completely dead. The battery is fully charged. The lights in the vehicle flash on and off. I had noticed lately that the ingnition key had been difficult to turn. Does anyone know
what this could be?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.