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There are a few steps to invoke a lambda function in a NestJS application:

1. Use the aws-sdk package to create an instance of the Lambda service:

import * as AWS from 'aws-sdk';

const lambda = new AWS.Lambda({
  region: 'us-east-1' // replace with your region
});

1. Call the invoke method of the Lambda service, passing in the function name and any payload as parameters:

const params = {
  FunctionName: 'my-function',
  Payload: JSON.stringify({ foo: 'bar' })
};

lambda.invoke(params, (error, result) => {
  if (error) {
    console.error(error);
  } else {
    console.log(result.Payload.toString());
  }
});

1. Handle the response from the Lambda function in the callback function. The response is returned in the Payload property of the result object as a base64-encoded string, so you may need to deserialize it before using it.

Note that you will need appropriate IAM permissions to invoke the Lambda function, so make sure to set up your AWS credentials correctly.