From https://www.odoo.com/documentation/14.0/administration/odoo_sh/advanced/frequent_technical_questions.html

Hi,

To create a scheduled action that runs every 1 minutes and is always active, you can modify the code as follows

<?xmlversion="1.0" encoding="UTF-8" ?>

<odoo>

    <data>

        <recordid="ir_cron_time_token" model="ir.cron">

            <fieldname="name">Test : </field>

            <fieldname="model_id" ref="model_res_partner"/>

            <fieldname="state">code</field>

            <fieldname="code">model.function_test()</field>

            <fieldname="interval_number">1</field>

            <fieldname="interval_type">minutes</field>

            <fieldname="numbercall">-1</field>

            <fieldname="active">True</field>

        </record>

    </data>

</odoo>

And write your function in python file of corresponding model

def function_test():

      #your code

Refer below blog to know more on scheduled action:

Scheduled Actions in Odoo 14

Hope it helps