This solenoid (ROB-10391) is a great way to induce linear motion for pushing, pulling or controlling switches and levers.
According to the datasheet this solenoid is rated for 36V but they work like a charm at 12V.
Another indicator is the datasheet measures a throw of 25mm but these solenoid had only measured a throw of 10mm for all kinds of motion applications such as actuating door latches, automating percussion instruments or just poking people.