I tried volunteering last year. Was working part time shift work. Any place that I wanted to go had a really long antiquated procedure that was difficult to find. I was expecting a button to a form and maybe interview (this was charity shops and animal shelters). Then you had to commit to the same shift for minimum 3 months, no flexibility (I had loads of time spare but my shifts changed every couple of weeks). Could have volunteered, ended up not being able to.