If this boat is kept outside, most likely the button is simply stuck. It happens and is a common issue on boats kept at lake houses, etc
I use the handle of a screwdriver and tap the base of the handle while wiggling the controls to get the button to pop out. Then lubricate as needed.
Sometimes you have to pull the control apart to lube the bits
It's a 3 beer job to pull the controls, take apart and put back together. Take pictures along the way. The factory service manual for the controls helps
Note: sometimes there are detent pins and springs that go "sproing". Sometimes the button breaks and needs replacement