How do you stretch narrow shoes for wide feet?

I'm curious about a common problem that many people face - how do you stretch narrow shoes to accommodate wider feet? It seems like a tricky task, especially if the shoes are made from materials that don't easily stretch. Are there any tried-and-true methods for expanding the width of a shoe's interior, without damaging the shoe itself? I'd love to hear about any techniques or products that might help make narrow shoes more comfortable for those with wider feet.