And if you really want to DIY it, and it’s just latex paint, it’s pretty easy to strip.
Buy a cheap heatgun from harbor freight for like $15 and a metal large scraper, and cook the paint until it wrinkles and just scrape it with a metal scraper… Any residue, follow up with a good paint remover solvent from home depot Klean-Strip Premium Paint Stripper or something like that. Just don’t cook the paint until the wood starts smoking or burning, you might warp the door.