Q: Does "work" have the same meaning in the following two sentences?

I will work hard to improve my grades.

He's working in a bar.

A: the same meaning

Q: Does "sell" have the same meaning in the following two sentences?

The French try to sell us their image as great lovers.

The brothers sell shoes.

A: different meanings

Q: Does "serve" have the same meaning in the following two sentences?

They serve a restricted role on the bench.

The minister served the King for many years.

A:
different meanings