How to get 2.5yr old to use potty

We bought a toddler potty at first but he was not interested at all. He played with it like a toy (literally put it on his head) so I bought a seat to put on our actual toilet. He sits there for maybe a minute at most. Never pees! I try several times a day. I let him watch us use the restroom but he doesn’t care. Daycare is on us about getting him potty trained but the pediatrician thinks he may not be ready…