Could I still be fired?

While I was on lunch i had a regular customer come up to me. He handed me a unopened box that contained a brand new laptop as a thanks.

His car was dead while I was on my first 15, I offered to jump start his suv. He said please so I did.

Now people at work are saying I’ll get fired for actually accepting. The thing Is, I tried to decline but he kept insisting. He said he owned a computer company. He eventually just said no give backs and kinda jogged to his car.

Will I get fired even though I wasn’t technically clocked in?