[Python] Unable to Trigger Lambda function using Python code from my local setup

I am trying to trigger a Lambda function using Python code as below

import boto3
from botocore.exceptions import NoCredentialsError, PartialCredentialsError

def get_lambda_client():
return boto3.client('lambda')

def invoke_lambda():
lambda_client = get_lambda_client()
if lambda_client:
try:
response = lambda_client.invoke(
FunctionName='MyLambdaFunctionName',
InvocationType='RequestResponse', # or 'event for async invocation'
Payload=b'{}' #Not sending any payload
)
print(f" the response from the aws = {response}")
except Exception as e:
print(f" Error invoking Lambda function: {e}")

invoke_lambda()


with following policy attached to the Role

1. 
   Policy to trigger Lambda function
   
   {
   "Version": "2012-10-17",
   "Statement": [
   {
   "Effect": "Allow",
   "Action": "lambda:InvokeFunction",
   "Resource": "< arn of my lambda function>"
   },
   {
   "Effect": "Allow",
   "Action": "sts:AssumeRole",
   "Resource": "< arn of the role I created for lambda function which intern
   will trigger aws step function>"
   }
   ]
   }
2. 
   Trusted policy for the role I created for this Lambda function trigger
   
   {
   "Version": "2012-10-17",
   "Statement": [
   {
   "Effect": "Allow",
   "Principal": {
   "Service": "lambda.amazonaws.com",
   "AWS": "<arn for the iam user>"
   },
   "Action": "sts:AssumeRole"
   }
   ]
   }

please let me know if anything is missing here. The error I am getting when I try to trigger lambda function from python code is

Error invoking Lambda function: An error occurred (ExpiredTokenException) when calling the Invoke operation: The security token included in the request is expired


Suggest the solution which can be used here by assuming the sts role. considering that I don't have permission to fetch AccessKey, SecreteKey and SessionToken.

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