My dd heard through friends parents about a waitressing job going. She went up there with a cv and got taken on. She was 15.
Ds went to the local golf club to ask if they needed any caddies. They didn't but offered him work in the kitchen. He was 14.
Someone I worked with had a second job waitressing at wedding events and said staff turnover was high. Dd and ds both asked for and got offered work there.
Through the weddings, ds got chatting to an events co-ordinator who organised a pop-up restaurant throughout the summer. They wanted kitchen staff and ds was offered as many or as few shifts as he wanted during August.
Dd then went on to work in a supermarket and they have her back everytime she's home from university.
My friend's ds left his job in a warehouse so ds went to the agency to see if there was a vacancy. He got that job paying £10 an hour.
When he went to university he got part time work in retail.
There are jobs out there, you just need to talk to everyone and ask about. Ask people where they work and if their company is hiring.