laravel migration error SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint

I'm trying to make a foreign key constraint using laravel migration

This my first table

public function up()
    {
        Schema::create('postal_codes', function (Blueprint $table) {
            $table->char('id', 5)->primary();
            $table->string('district', 150);
            $table->string('city', 150);
            $table->integer('province_id')->unsigned();
        });

        Schema::table('postal_codes', function ($table) {
            $table->foreign('province_id')->references('id')->on('provinces');
        });

    }

And this is my second table

public function up()
    {
        Schema::create('postal_code_details', function (Blueprint $table) {
            $table->id();
            $table->string('urban', 150);
            $table->char('postal_code', 5);
        });

        Schema::table('postal_code_details', function ($table) {
            $table->foreign('postal_code', 5)->references('id')->on('postal_codes');            
        });
    }

when i run

php artisan migrate:fresh

get error something like this :

SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table postal_code_details add constraint 5 foreign key (postal_code) references postal_codes (id))

Im using mySQL for database What wrong with the code?

via Chebli Mohamed