Can I trade in if my iPhone if it’s not working

No. Trade-Ins for a value or discount on a new device require a functional iPhone to trade in. If it's not working, you can get it repaired, and then you can trade it in. Or you can simply have Apple recycle it.

click here for details ➡️ Apple Trade In - Apple

phone has to be in working order to get trade in value.. otherwise it'll just need to be recycled

Apple Trade In - Apple

if your details are correct and you're looking to trade in an iPhone 5s, I don't think you'd get anything for a phone that old anyways