Cron Job not Working

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

hooks.py

scheduler_events = {
    "cron": {
        "*/15 * * * *": [
            "footwear_erpnext.tasks.cron.testing_cron_job"
        ]
    }
}

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 erp.next.host migrate;
bench --site erp.next.host clear-cache

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