Keeps running after pull out the key

Car keeps running even after I put it in park and pull out the key shows brake and abs shuts after a few minuteslike5 the fan stays on have to unplug battery to stop and car will not turn off even out the key the ac makes a loud sound inside but not outside cools good than stops though blower is working and has plenty freon any suggestions am retired and can not afford too much need help be blessed