Cron Job not Working

I have been trying to run a cron job which runs every 15 minutes but it keeps running every minute

scheduler_events = {
    "cron": {
        "*/15 * * * *": [

Try to execute it in the terminal first to check if the path and function is ok using:
bench execute footwear_erpnext.tasks.cron.testing_cron_job

if everything is ok then use these commands to enable the scheduler:

bench enable-scheduler
bench scheduler enable
bench scheduler resume
bench trigger-scheduler-event all
sudo supervisorctl restart all

Also worth a try:

bench --site migrate;
bench --site clear-cache

They tend to clean up things that have got themselves tied up in knots.